Installation: Super easy. Took 10 min.
Planted in the seat - I didnt realize how much of a difference this makes on backroads. Normally you are constantly compensating for lean with your body and arms, freeing yourself up from that lets you focus on car control and other inputs
Easy for daily use - Takes 30 seconds to go from 3 point seat belt --> 4 point harness
Airbag remains intact - not all harness setups allow for this
Bolt-in Install - This was really important to me since E39 M5s are appreciating and I didnt want to drill anything out
Harness Grips - recommend purchasing. Soo much easier tighten the harness
Wasnt expecting the shoulder pain. Makes sense why they make harness pads
Overall: 10/10 - wish I had done this sooner