I'm still managing with streching and working on my back muscles to keep everything in check, but dont rule out an intervention if needed later. Got it at 23 years of age, now at 31. Fine for now if I watch out what I do with my back and don't ride a DF bike.
I do aspire to run above 300k, already have one 400k planned for the beggining of june. For now with the Q, the S40 is still in the box, waiting for parts to build it up. I'm hoping the S40 will be fine with 30mm tires, but if it isn't, I'll either get some beefier 650b wheels/tires or switch back to the Q, I will not sell it right away (if at all).
Also like graveling with the Q, just if there isn't too much of a grade, which is rare around me. About the cruzbike company - totally agree. I live far away and they've been really helpfull in everything I asked/ordered.