Hey guys thanks for the input on the Sparco, Pro ADV, I have a Sparco Circuit pro in my car now, i am building a new car and i think its very close to the Pro ADV, i am a little bigger 5'11 200 lbs 34 inch waist and when i sat in the Pro ADV it felt perfect for me. My Circuit pro is a tight fit in the car too, but it fits.
I am under the impression they only make one size seat so if I am wrong Alberto correct me, you said you got the large size, do you know if there was size options.
You hate to make a bad choice since they are $999.99.
I'm 5'9", 190 lbs, 36" w. The seat does feel good. There are size options. Well, there were anyway when I got mine (from Wine Country Motorsports). I just looked on Sparco's web site and the seat looks a bit different. Even the halo doesn't look as bulky as mine. Mine looks more like the one on the SafeRacer site. Sparco probably made tweeks since I got mine in late 2010.
The Pro ADV is definitely more 'roomy' than the Circuit while maintaining what I believe is the same or similar general measurements. Especially on the seat bottom since the seat bottom flares outward toward your knees providing more space for the family jewels and easier legwork on the pedals in the car.
The halo is the only thing that really bothers me on this seat. My shoulders aren't wide enough that the wing touching the door bothers me too much. The net touching the halo is a bit of an inconvenience when attaching the window net but I'm used to it now.
FWIW, with holidays and black friday coming up, you may want to wait to see if some deals pop up - like that 850 deal I got on mine. I think I bought it thanksgiving weekend when Wine Country had a sale. I got it in red b/c it adds HP (of course). 