Hey, I've been using X-Feel Blast for about a year but I can't really get used to the stiffness, and even though it's supposed to be a smashing racket I'm not generating much power with my smash. I very rarely smash in play though.
Something more medium flex which is a bit easier to handle, which you also can play doubles with (Im mainly playing singles).
My level is average (currently playing B ranking tournaments).
I've been looking a bit at Yonex VT5/7/70, Adizero Pro (when it's released?), but it's such a jungle, I have no idea when there's so many models to choose in between.