I have a little 250 Quad racer that's like that but that's the way I want it. Like with my 3D R/C planes, stability can sometimes be a negative thing.
With my 250 I don't dare take my eyes off of it or hands off the sticks. It'll be gone so freakin quick. lol
Just completely unstable... but agile as heck and super maneuverable.
I guess for stability with the Q... it's all about the gps.