It's a very nice light, with an unusual combination of high output, good throw, and small size. The main disadvantage, which is related to the last point, is that it will not fit a standard protected 17670 rechargeable cell.
The Fenix TK12 is a considerably larger and heavier flashlight with similar output and throw to the Quark Turbo. But the Fenix will accommodate not only 17670, but also the larger 18650 protected cell.