Logitech Waves are reasonably alright I must say. I remember someone claiming that they reminded them of Black Alps. The worst thing about them is the large web browser media key which has a big blue Internet Explorer icon on it... Although that picture doesn't have one, so maybe the one I used was an older version.
That was me. I was rather impressed by the Logitech Waves. It seems that they use a different rubber dome setup for that 'board than they do their others. Basically, it's lighter and more crisp and feels like it has a similar force curve and resistance as black ALPS (complicated, like those in the Dell) but not as plasticky feeling as you might imgine. IMO, Logitech keyboards are like typing on stiff sponges. I can't validate, let alone describe, any physical differences between the Wave or their other offerings, but the ones I have tried at stores and a co-worker's, they are pretty consistant and rather nice (for domes). The biggest drawback of the Wave is that there are no Lock lights on the 'board, so you have to install some software to get some temporary notifications on the screen.