I use one every day and am typing this on one right now. I actually like it so much, I bought 2 more. One for work and one for home plus and extra on in my closet in case the company goes out of business.

The blank aspect is kinda cool but I really like the feel and sound of the thing. I don't know if I type any faster with it and finding some characters like % and ^ can be difficult at first.

I also know of several former co-workers that use them.

I've been using a Das Keyboard (original and II) for the last several years. Surrounded by 4 of them right now actually.

The model II is supposed to be closer to the IBM Model M. Don't know how close it is, but I love the feel.

Originally I got one for the geek cred (lamer), but once you go blank you never go back... err...

Yes, I bought one to use at work and it's now the only keyboard I use.

It took a little getting used to, but now the only time I miss a keyboard with letters on the keys is typing passwords one-handed while I'm on the phone. Seriously, I don't even notice that the keys are blank any more.