The spine of eaach Portenzo case is stiff, so if you fold the cover back and place the iPad down on a flat surface, you'll find it tilted at a slight angle. But the thinner iPad 2 means this angle isn't as large as it was for the original iPad, and as a result, the angle's not quite as good for typing—and especially not for viewing.
Although the iPad 2's speaker grille is located on the back of the device, the Portenzo case cleverly reroutes the sound back out toward you via some scalloped openings along the bottom edge of the frame. In fact, the iPad 2's audio is impressively loud when in either Portenzo case.
These are both good cases, the best example of the Moleskine-notebook genre I've seen so far for the iPad 2. If you're looking to wrap your iPad in some pretty camouflage, the Portenzo cases excellent choices. Their biggest flaw, in fact, is a consequence of the iPad 2's thinner, lighter design—these cases make the iPad 2 feel roughly the same size and weight as its predecessor. As for which to get, unless you prefer the Composition's retro design—which I find a bit gimmicky—go for the Notebook Style and save yourself $20.
STM Skinny for iPad 2
If the goal is to keep your iPad 2 as thin and light as possible while giving it some added protection, STM's $40 Skinny for iPad 2 ( Macworld rated 3.5 out of 5 mice ) is a great choice. The front cover is a thin, rigid panel, with soft material on the inside and rugged polyester on the outside. The back of the Skinny is a rigid-plastic shell covered in the same rugged polyester as the front cover. When you close the front cover, it latches magnetically to the rear piece. The cover supports the iPad 2's magnetic sleep/wake feature, so when you lift the lid, the iPad automatically wakes.
The case's magnetic cover "latch" is strong enough that it's a bit curious to find a thin flap that wraps around and slides into a pocket on the back to keep the case even more securely closed. But the flap becomes more useful when you fold the cover behind the iPad and insert that flap in the pocket—the cover then acts as a stand that holds the iPad upright in landscape mode, perfect for watching video. Unfortunately, while this is useful, most of the time I found this flap just gets in the way, sticking out like it does from the front cover.
To insert the iPad into the Skinny, you slide it under two plastic tabs in the corners of the back piece and then click it into the two other corners. It's easy to insert and remove the iPad from the shell, and the shell holds the device securely. All ports, buttons, and cameras are accessible. The case is available in sage (light green), mushroom (gray), berry (red), or black.