My only gripe with the xoom is the weight. I've had the silicone case on the xoom since day one. I decided to remove it and it seems to make a noticeable difference. It feels less bulky as well. But who knows, maybe after some time it will feel heavy again.
The only problem now is that it is slippery, making it harder to hold.
I noticed that, but I'm keeping the silicon case for now until I'm sure that I'm keeping the device. I'm waiting for the transformer, just because I don't care the screen on the xoom that much. Once I decide that the xoom still better, then the silicon case goes bye-bye. I rather have it naked.