My brother-in-law has one of the first Asus Transformers with the keyboard dock and I am so insanely jealous of it I can't see straight. (It's just cool, and I want it!). He loves it, or at least he did when he got it. He may have upgraded to one of the newer ones by now.
This isn't a laptop really, but I have a Windows tablet with a snap-on keyboard that I use a lot, or sometimes I pair a Bluetooth keyboard with any of my other tablets.