Just because they have the same megapixel count, though, doesn't mean that the front and rear cameras are the same. They differ quite vastly on color quality, thanks to their different sensors and pixel size. The same scenes shot with the front camera looked washed-out and pale compared with those taken with the rear camera, which generally captured vibrant, richly colored images. OnePlus 3T also added a layer of sapphire glass to the back camera to protect it from scratches that could forever mar your shots.

As we mentioned in our review of the OnePlus 3, the rear camera is capable in most lighting conditions, but won't impress the way the iPhone 7 Plus or many other smartphone cameras would. It delivered sharp, accurately colored exterior shots on sunny days, and rendered a respectable amount of detail in low light, but images looked flat indoors. Still, it's perfectly adequate, and that front camera will please selfie fans like myself.

Performance and battery life

Most flagship phones released this year use the Snapdragon 820 processor, rather than the newer 821 chip that Qualcomm started offering later in the year. So, only the Google Pixel and LeEco Le Pro3 have it, which makes the OnePlus 3 slightly less competitive on specs (the LePro 3 costs the same as the OnePlus 3). I imagine this is one of the biggest reasons OnePlus decided to drop a new flagship so soon after unveiling its previous one, but still, it's a smart move.

OnePlus 3T OnePlus 3 LeEco Le Pro3 Google Pixel AndEBench Pro 14,399 13,841 13,354 14,941 Vellamo 3.0 6,144 5,202 6,559 5,343 3DMark IS Unlimited 31,691 30,058 31,753 28,645 GFXBench 3.0 1080p Manhattan Offscreen (fps) 50 48 30 46 CF-Bench 51,262 41,653 42,572 30,997

The Snapdragon 821 processor makes the OnePlus 3T faster than the original, which was already pretty speedy. It's hard to tell the difference in day-to-day performance, because I'm not a robot and can't detect minute differences in app-launch times, but overall the 3T was very responsive. Its Vellamo score of 6,144 beat the OnePlus 3, the Samsung Galaxy S7, the HTC 10 and the Google Pixel and Pixel XL, while its AndEBench result trumped the OnePlus 3 and the Galaxy S7 but fell short of the Pixel phones and HTC 10. The OnePlus 3T also bested the field in graphics-performance tests.

This means you're mostly going to see similar speeds across these phones. Considering the Pixels use the same chip (albeit with less RAM) but cost hundreds of dollars more, the OnePlus 3T really delivers on value here.

The OnePlus 3T has the same 6GB of RAM as the original, which makes for swift multitasking. OnePlus says it also improved the launch speed for large apps and games, so you won't have to wait quite as long to open these programs. I also found call quality to be perfectly adequate. I called a friend who was in Queens (on T-Mobile's network), and he was able to accurately repeat a string of numbers that I recited, despite his dog barking in the background, which I heard as well. Unfortunately, as with previous OnePlus handsets, the 3T works only on GSM carriers such as AT&T and T-Mobile.

One area where the company says it received the most negative feedback about the OnePlus 3 was battery life. In addition to simply bumping up the battery capacity to 3,400mAh from 3,000mAh, OnePlus tuned the power efficiency of the CPU so that despite its faster speed, it sips power at the same rate as the previous handset.

I was expecting a slight increment on endurance and wasn't quite prepared for the 3T's epic stamina. It lasted 16 hours and seven minutes on Engadget's battery test, which involves looping an HD video with the screen set to 50 percent brightness until the device conks out. That's almost six hours more than the OnePlus 3's runtime, and two hours longer than the Google Pixel XL, which has a 3,450mAh bank.

When the phone does eventually run out of juice, it charges back up to offer what the company says is a day's worth of power in 30 minutes. After the OnePlus 3T finally died on Engadget's battery test, I plugged it in and was able to take it on a quick video shoot just 15 minutes after, because it already got back up to 20 percent in that time. Not only is this fast, but that's enough juice to last at least two hours.

The competition

The OnePlus 3T faces direct competition from the LeEco Le Pro3, which uses the same processor with less RAM for $400. But the Le Pro3 suffers from unintuitive software, has a less vibrant display and doesn't last as long as the 3T.

Google's Pixel phones also use the same processors, offering similar (if not better) performance in a premium frame. These handsets have better cameras and run the latest version of Android (7.0 Nougat), offering a cleaner interface and helpful new features like Google Assistant. But the Pixel lineup starts at $800, which is nearly twice the OnePlus 3T's asking price. Indeed, the latest OnePlus handset is probably the best handset you're going to find for around $440.

Wrap-up

The OnePlus 3T improves things about the original that were slightly lacking, such as battery life, and amps up on performance and software, making it a strong option for power users. I particularly love the sharper front camera for its solid performance in low light. I'd also argue that the boost in endurance alone is worth the $39 price hike, but the previous iteration offered enough stamina for the average user who may not want to shell out for a few extra hours of juice. As a replacement for an existing flagship, the OnePlus 3T is a refinement that not only feels timely, but also well-planned and executed. You'd have a hard time finding a better phone for the price.