The genuine ones are pretty decent.
Most of the newer models are made to look pretty flashy for all the cool guys, but theyre not a bad seat.
I had an old early 90s bride fixed back a while ago, and it was one of the most comfy seats Ive had. They seem to run them in alot of japanese racing cars, so Id assume them to be better than our monza/autotechnica ones over here.
Only bad thing is that theyre not ADR or FIA approved, so would only be good for up to club level motorsport. Im sure you could get them approved (for sure ADR anyways) but it depends how deep your pockets are.