I have the Q10X-D, which is the 4X10 of the same series, and it's got plenty of cut, but if you're looking for deep bass response, these cabs aren't for you. The low end is merely sufficient, and the tonal emphasis of the cab lies more in the midrange.
That said, the tone I get with my Series I through my GK 1001RB into this cab is really tight and punchy, and it's great for cutting through a mix. I found the high end to be too harsh with the tweeter connected, so I disconnected it, but your mileage may vary.
To answer your question, it would probably work fine for the gigs you describe, but so would a single 15. If I were in your situation, I'd invest in a different cab unless the price was too good to pass up.