It’s a half-inch-thick slab, all glass on top, aluminum on the back. Hardly any buttons at all — just a big Home button below the screen. It takes you to the Home screen full of apps, just as on an iPhone.

Image Absurd or revolutionary? Even before its release, the iPad is a polarizing device. Credit... Marcio Jose Sanchez/Associated Press

One model gets online only in Wi-Fi hot spots ($500 to $700, for storage capacities from 16 to 64 gigabytes). The other model can get online either using Wi-Fi or, when you’re out and about, using AT&T’s cellular network; that feature adds $130 to each price.

You operate the iPad by tapping and dragging on the glass with your fingers, just as on the iPhone. When the very glossy 9.7-inch screen is off, every fingerprint is grossly apparent.

There’s an e-book reader app, but it’s not going to rescue the newspaper and book industries (sorry, media pundits). The selection is puny (60,000 titles for now). You can’t read well in direct sunlight. At 1.5 pounds, the iPad gets heavy in your hand after awhile (the Kindle is 10 ounces). And you can’t read books from the Apple bookstore on any other machine — not even a Mac or iPhone.

When the iPad is upright, typing on the on-screen keyboard is a horrible experience; when the iPad is turned 90 degrees, the keyboard is just barely usable (because it’s bigger). A $70 keyboard dock will be available in April, but then you’re carting around two pieces.

At least Apple had the decency to give the iPad a really fast processor. Things open fast, scroll fast, load fast. Surfing the Web is a heck of a lot better than on the tiny iPhone screen — first, because it’s so fast, and second, because you don’t have to do nearly as much zooming and panning.

But as any Slashdot.org reader can tell you, the iPad can’t play Flash video. Apple has this thing against Flash, the Web’s most popular video format; says it’s buggy, it’s not secure and depletes the battery. Well, fine, but meanwhile, thousands of Web sites show up with empty white squares on the iPad — places where videos or animations are supposed to play.