I finally tried the car at a track event last weekend. (Mosport (CTMP) with Trillium BMWCC).
Car is even stiffer around corners. Seat and harness are a great mod. Did not check laptimes but know that I was quicker based on other "opponents" I usually track "agains't"
I did not have to re-set myself in my seat after the very fast corners that are at this track. So it did exactly what it was supposed to do.
Hans, seat and harness adds easily an extra 4 minutes to strap myself in the car before a session.