It does not compare to the wireless iMac keyboard or the MacBook keyboard, because it is smaller and in a 9.7" frame. Keys are obviously closer together. Other than that, the feel when tapping the keys is similar, key travel is similar, there is no clickity clack noise like you find on cheap keyboard, the backlight on the keys is acceptable with 3 brightness settings (a feature I like, especially in dark rooms at night!), and I do like the fact that it has the iPad specific keys, instead of F1-F12 keys at the top of the keyboard.
I have only been using this for a day, but I really enjoy it. And I def like that it is aluminum. Matches the iPad nicely. I hae found one small mistake around the camera on the back (looks like it is a tad cockeyed), but it does not block the camera in any way. For $60, I can overlook it though.