After using my clear back cover that I purchased, I'd have to say my only complaint is that it isn't the tightest cover. It's no where near as snug as the Apple bumper, but it's also not flimsy and coming off on it's own. Really, the looseness primarily exists where the cover slights covers the bezel, but it's not a problem in any way, shape or form.
Holes are big enough for all of the plugs, switches, and camera. Doesn't intrude. Feels fine when holding it. Build quality is more reminiscent of a $7-$11 cover, not the $14 I paid for it, but I don't regret it at all. Serves it's purpose quite fine.
Now if anyone knows, I would like to find a thicker portfolio-type case for the iPad 2, primarily one that has folders or pockets for books and a place for a stylus pen. And would allow for the SmartCover and the back cover to fit.
This would be for transporting it to school and back rather than taking my entire backpack with me for two books and a one-inch thick device.