i rate demon tweeks rather highly for their service to be honest, and for the stuff iv bought they have been very competitive on pricing, they were the cheapest for my sparco evo 2s, my OMP harnesses, and all my stack gauges, and their speed of delivery is always great!
obviously some of their stuff is priced a bit crazy, but thats just exploiting the usual max power loving generation who arent clever enough to shop around lol