I hit the Q5 315 today side by side with the QTour.
I'll start with the 315. I really like that racquet. It comes around very quickly, yet feel pretty solid. I was getting a lot of spin with it and it felt better and better the faster I swung. I liked the comfort, too. On the feel front, it felt pretty modern. I could feel the frame breathe more than with a traditional box beam racquet. I wouldn't say it was overly hollow as the kinetic provided a dampened feel, but it is definitely more modern in its feel.
Out of the two, I preferred the QTour. I like the classic feel. The response is smooth and the feel is plush. I find great directional control with it and it is just closer to the racquets I'm enjoying right now such as the Prestige MP and C10 Pro.