I also noticed some of the problems you did with my CX2610. The corners are sharp and I am thinking about just covering them with tape or something. The directional pad on the screen is stiff and hard to use. It frequently performs the wrong function. Sometimes I am trying to increase the volume but it brightens the screen instead. Dont know what we can do about that. The other major problem I am having is with heat. I simply cant use it on my lap without being really uncomfortable.
I did opt for the Best Buy warranty simply because a lot of people on here have talked about the fragility of tablet pc's and that they are the item that is brought back in the most to best buy for repair. Also, Best Buy covers wear and tear, so if my screen gets really scratched up or my hinge breaks, theyll cover it. They replace the battery too, which I am thinking is likely to die out within three years since I use it so much.