I suffer from occasional bouts of sciatica and I also have problems with my right knee that require me to wear an elastic brace whenever I do any kind of moderate exercise. I've had these problems for years and years thanks to lots of running and skiing. I found it hard to drive any kind of distance because of them. In fact, in 2008 I switched to a Volvo because I'd heard their seats were the best. And yes, those seats did help with the problem enormously. So I was hesitant to switch to a Tesla or any other kind of car. But exactly a year ago today, I took the plunge and picked up my M3LR. For me at least, the seats in my M3 are an improvement over Volvo's seats. I never have any knee pain or sciatic pain when driving my M3 long distances. I'm well aware that the source of my pain may be different than someone else's pain so I don't dispute what you are saying, but perhaps you should try some different seating positions. Also, there are a series of exercises any physical therapist can give you to alleviate sciatic pain. They need to be done daily or your pain will come back, but they do work.