I have crashed in my 2 piece teknic suit at over 100 on the track and slid quite a distance on my arse and side. It held up extremely well with a slight tear where the keprotec is sewn into the leather. I hit HARD and did'nt have a mark on me. I still use it to this day. I think I paid like 600 for the thing and it was worht every penny. I'm sure there are better suits out there but for the $ I think they are top notch. For the street, I would look into getting something with a good back protector as well. People tend to overlook the benefits of a working unfused spinal column.
My 02
My 02