I've used my coach's k90 and it felt really nice. I really enjoyed playing it, but then it was my coach's so I obviously can't keep it. Right now, K90s are like 100 bucks flat or less at my local shop. When I get better, I probably would want the K90 to be my racket. Recently, I read on TT that with the BLX's the 6.1 tour line is losing its tradition by not braiding kevlar into the matrix? Thats what I read, but who knows.