Well, these CAN look very good. I built one a while back and the S-Video output was darn near indistinguishable from the RGB output from the game I had it hooked up to. Composite didn't look so hot, though.
I can't tell what chips they're using in that picture. The Analog Devices AD724/AD725 seem to do a very good job, but since I can't tell what they're using (and it doesn't look like what I used), I can't really comment on that board specifically.
I could run some of my design if people want. Minimum to make it feasible for me though is about 10-20.