Meh. Went to Quince once with some friends. The food way okay, but not amazing, and you don't get a lot of it for the price. In fact, we were seriously debating stopping in at the nearby Mandarin immediately after our meal...not a good sign.
I had the house-made chestnut fettuccine with a sort of balsamic sauce and a few different kinds of mushrooms. The fettuccine didn't taste like chestnut at all - it just tasted like whole wheat pasta. It was pretty good overall, but the portion was laughably small for $17. Noodles and mushrooms aren't exactly super pricey...give me more of them.
I also tried someone's gnocchi with lamb ragu. Again, it was okay, but it was basically just (mushy) gnocchi that had a sort of spaghetti sauce made with lamb instead of the usual beef. Meh.
All in all, my experience was okay, but not as awesome as I'd expected based on the prices. I don't see myself ever going back, unless it's during Summerlicious. Sigh...I can't wait for Summerlicious.