I have the clear one installed on my new wireless key board. It was very easy to install and so far it does what it's supposed to do.
In time I may order one for my wired Apple extended key board. A lot depends on how long the batteries last on the wireless keyboard.
I just got the 27" i7 on 12/04, so I haven't got a lot of time using it! It beats the old one that that I have on my 17" Flat Panel iMac. It was thick plastic and didn't stay very close to the keys. The iSkin seems to lay flat to the keys! So, I'm happy with it!