I have a Das Keyboard as well as a Unicomp Model M. Unfortunately, the Unicomp needs to go in for repair. In terms of overall size, I like Das Keyboard better, but I haven't tried the smaller Unicomps. That said, I think the tactile feedback of the Unicomps is much closer to the Model M than the Das Keyboard.

Both are far superior to many cheap keyboards.

I only wish Unicomp or Das Keyboard came in a bluetooth version. The Das Keyboard using 2 USB ports is a tad bogus.