I have to echo the above poster's sentiments. I'm typing on a "crappy" HP rubber dome (though not exactly the same as the ones shown in the OP), and it's actually really not that bad.
I have used other rubber domes before (Logitech, Microsoft, Apple), and I really have to say, the HP ones are the best of the lot so far. A lot of it might have to do with the low-profile keys, though. It makes for a lot less typos, and a far easier typing experience.