The GTR33 seats are not that solid. My drivers seat back was leaning to the left, then it broke and sagged just 3 weeks after buying the car. I pulled it all apart and straightened the left side back mount, which was just some crap steel sheet pressed with a small lip for strength and 2 stress concentrating bends across the pressing. After a significant quantity of bracing welds and quenching I'm satisfied (not "happy"). Once the initial movement started it appears that fatigue failures started throughout the whole bracket, so it's a bit cheap in my educated structural engineers opinion. Most un-GTR like in quality.
Further, without the back fully supporting the base, tie-ing the whole structure together, there is evidence of movement in the base, indicating fatigue damage there as well so I'll have to remove the seat again and investigate to determine the damage.
For the outrageous price asked for these seats, you would expect outstanding quality. They are good in a track environment with a full harness but uncomfortable on long drives or for those with wide shoulders but nowhere near the quality or strength expected.
Opinion! Not worth more than $400 each in excellent condition from my close inspection of the construction. Just a factory seat, but an above average one.
I'll take Recaro's anyday.