Dont get one IMHO. I have used ZAGG on all of my things. but thats because I am rough with my ipods and phones. my computer gets put on lots of surfaces which inevitably have crap on it which scratch the bottom
But the ipad doesn't fit in a pocket. is much more expensive than ipods or phones, and is designed to be used in cases, whereas computers are not. (overheat, cumbersome, etc.)
so, get a case which covers the screen and treat the ipad like its a $600 piece of glass. you dont want to cover up that beautiful screen!
I use one on my Storm 2 and one big thing that it helped with is finger prints. My screen was a finger print magnet prior to adding the invisishield and now it hardly shows fingerprints at all. For that alone it might be worth while. My plan is to give it a try and see what I think. The worst thing that can happen is that I decide to rip it off and end up having wasted $35 or so. Also, I will have the guy in the mall install it - that is key cuz I hate trying to get the @#$# things to go on right!
-Greg
That's a good point Greg. fortunately, for me, I have dry calused hands...so fingerprints are less a problem for me. but for dana, that is a consideration I did not address which may be relevant to you.
on a side note, I noticed invisible shields actually absorb oils. I had one on my macbook pro for the palms and trackpad. the damn thing turned a disgusting brown from months and months of resting my palms on it. I also tried an experiment; I drew on it with a gel pen - which is oil based; the ink wiped away leaving brown oils in the shield in the shape of the drawing. so evidently, the polymer is not oleophobic, but oleophilic (oil-liking). which explains why fingerprints don't show up on it - it just absorbs the oils from your fingerprints. I also have not found a solvent or surfactant that will take the oils out (I am a chemist) and I have found even mild solvents such as MEOH will damage the shield. just an observation I though might be interesting for you
) to read this. 
