I own the set that techkeys was selling for a short bit, didn't purchase them through him, but another member off this site who had just bought them and couldn't deal with keycaps that are so close to blanks.
I honestly really enjoy them, I am slightly bias as I will always choose pbt now over abs, they feel better to me and look newer for much longer.
These are as I said though, very very similar to blanks. It takes hitting the keys with the light from a desk lamp at a very specific angle to reflect off the black legends on the keys.
I will admit sometimes in the morning I have to type my password in a couple of times if I have't been using the keyboard since the night before.
If you like pbt's and want to get a feel for what blanks would be like with a black dyesub cheat sheet printed on the caps, then these are for you. I won't be selling mine, they are great.