I think the first gen of the Belkin Snap Shields for iPad 3 must have been re-packaged iPad 2 cases if they were fitting that badly and cracking. As I said earlier in this thread, I intentionally bought a SnapShield for iPad 2 to go on my iPad 3 simply because I couldn't find anything else good that would come in in time for me to travel around with my new iPad right away. It fit really nicely and I did not feel like I had to force it on to the iPad at all.
However, when we were on vacation a couple of weeks later, I did notice that there was a lot of give/movement between the case and the back of the iPad. I didn't fit quite right. And obviously, the taper on the back didn't quite match. I took it off a few days after we got home to clean some lint off of the back, and the corner completely snapped off. My own fault for buying the wrong model, I guess. I wasn't mad--I made my own bed on that one.
However, this new one I have is designed for iPad 3. It went on perfectly, there is no give on the back, and you can tell there is a difference on the taper shape on the back. In general, I really like Belkin stuff. It looks nice and has never let me down. The SnapShield isn't going to protect you from drops, but it sure will allow you to have peace of mind about sliding the iPad across the table without scratching up the back.