Hardware

Even though the X Performance is the most high-end of the four Xperia phones Sony plans to launch in the US, you wouldn't be able to tell just by looking at it. In fact, do yourself a favor: Don't put an Xperia X Performance down next to a regular Xperia X, because you'd probably never tell them apart. From the 5-inch, IPS LCD display up front to the 23-megapixel camera around back, these two devices are nearly identical. Well, until you spill a drink on them, at least. The X Performance picks up where previous Sony flagships left off with an IP68-rated chassis that helps it shrug off dust and water with ease, even when you stick it under a soda machine and let sticky stuff like Coke fly.

Beyond that (and as the name implies) we're basically looking at an Xperia X with a faster quad-core Snapdragon 820. That has its ups and downs, though: The chipset, paired with 3GB of RAM, gives the X Performance flagship-level horsepower, but the phone still suffers from some irritating design quirks. For one, you'd think a modern flagship phone -- one that costs $700, no less -- would have a fingerprint sensor for quick and easy authentication. Nope! The international version has one, but we Americans have to do without. Meanwhile, the placement of the volume buttons beneath the sleep/wake button on the right edge just seems dumb. Unless you're a professional finger contortionist, it's really difficult to hold the X Performance in your right hand and turn the volume down. It might be a mainstay of Sony's "OmniBalance" design language, but that doesn't mean it's not a bad idea.

It's not all frustrating, though. The X Performance's fit and finish are lovely, and there's something alluringly ... friendly about its look. There's a physical, two-stage camera button sitting below those tricky volume keys, and it's generally a joy to use. On the other edge is a SIM/microSD card tray you can pull out with just your fingernail, instead of having to rely on a paper clip you had to scrounge for. That tray, by the way, will take memory cards as big as 200GB, which is helpful, since 12GB of the X Performance's 32GB storage allotment is eaten up by system software. Since the X Performance comes with a more powerful processor, it has a bigger battery than the normal X too, if only just. Think: 2,700mAh instead of 2,620mAh.

Display and sound

I liked this 5-inch, 1080p IPS LCD screen when I first saw it on the Xperia X, and my feelings about it haven't changed. It's a generally great panel, capable of bright, vivid colors and deep blacks. We have the one-two punch of Sony's Triluminos display tech and its X-Reality engine to thank for those colors, though you have the option to tweak the screen's white balance and saturation settings if the defaults aren't your speed.

While the screen Sony used hasn't changed, though, the context around that display couldn't be more different. A 1080p panel is fine for an ostensibly mid-range phone like the Xperia X, but some of the most impressive flagships we've seen this year came with Quad HD displays. Remember, this is a phone that costs $700 -- if Sony could squeeze an honest-to-goodness 4K screen into the Z5 Premium, why couldn't it have tried to at least match its competitors with a screen running at 2,560 x 1,440?

Resolution aside, I really can't complain about the X Performance's screen. The speakers, on the other hand, leave a little more to be desired. There are two drivers baked into the Xperia's face for stereo sound, and most of the time audio comes out clear, if a little spacious. The phone's maximum volume falls short of some competitors' too -- though, really, you probably weren't going to use this thing to run your next party playlist anyway. Curiously enough, you can make up for that lack of oomph a bit by putting it down on a table instead of holding it. Seriously! A selection of show tunes I played seemed noticeably meatier when the X Performance was sitting face up on a wooden table. Or, you know, you could just plug in a pair of headphones. If you do, you'll be prompted to go through an "automatic optimization" process that didn't seem to do much during my week of testing.

Software

While earlier Xperia phones didn't receive software updates in a timely manner, there's nothing to worry about here: The X Performance ships with Android 6.0.1 Marshmallow. As usual, it's obscured somewhat by Sony's custom interface, and it can be pretty damn polarizing. For the most part, I'm fond of Sony's use of bold colors and minimal changes to the core Android experience. Those changes aren't minimal enough for some, though; my new colleague Cherlynn is no fan of Sony's changes, stylistic or otherwise. Sure, you'll have to contend with a few widgets enabled out of the box, but for the most part Sony has done well staying out of Android's way. My only real gripe: Swiping right in the app launcher brings up a search screen with recommendations for apps you should download, and some of them are sponsored. Ugh.

That's not to say the X Performance doesn't come with extras. The upside to Sony's not having an overbearing carrier partner this time around is that there's no carrier bloatware in sight. Instead, the few pre-loaded apps here are welcome additions: The SwiftKey keyboard is enabled by default, for one, and the PlayStation app is there for those who want to control their PS4's. Still, you also get an undeletable copy of AVG Protection that you'll probably never use, and a Sony app called Sketch lets you doodle on photos you've taken. Why did we need this? It's a mystery for the ages. If it were up to me, all high-end Android phones would just ship with stock Android. Since that obviously will never happen, we'll have to keep dealing with custom UIs painted on top of Android. At least Sony's is among the least troublesome.

Camera

As mentioned, the Xperia X Performance has the same cameras as the bog-standard Xperia X, which means it has the same issues too. First, the good: The 13-megapixel selfie camera is pretty great, and the 23-megapixel main camera can snap some vibrant, detailed photos in well-lit conditions. It's fast to lock on to targets too, if not quite as fast as Samsung's Galaxy S7 line.

For situations with moving subjects, you'll be glad to know you can tap the target on-screen to make the focus follow it. (In my experience, it's good for babies, so-so for cats and kind of lousy for cars.) And there's really something to be said for having a physical shutter button, one that you can half-press to focus on something. They're more or less passé at this point, but as far as I'm concerned, the more physical controls, the better. If you require even more control, you can switch into a full manual mode that allows for adjustments to white balance, exposure and more.