I loved my Single Crown Shivers, super plush 100mm and I know people complained that they twisted a bit (and weighed the same as a small moon) but personally i liked them. I think to many people put to much stock in frame, fork, component stiffness (obviously it is important to an extent), but if everything continues to be 25% stiffer than last years we'll all be rattled to pieces. I seem to remember that Sunn used to build flex into their frames as when they tested super stiff frames they performed worse. Also why a lot of people prefer skinny steel tubes to fat Aluminium hardtails.
PS SC Shivers rocked (until the stantion protectors were destroyed and then they got damaged pretty fast). I think mine are still doing the rounds on a DJ bike somewhere and they were slightly twisted after a head on incident with a large pick up.