I was suffering from knee pain when training in Nike Air Pegasus and after a gait analysis session at Up and Running in Birmingham (sadly now departed) I purchased the GTS 6 shoes and have been happily running without problem ever since. I have now covered hundreds of miles in them and have recently purchased the GTS 7 to take me forward on the last month of my Flora London Marathon training. I hope you have the same result as me, I shall certainly be ticking with them.