I havent had a ton of experience with the 15's, but Ive installed and played with quite a few others, 10" off a BX1206d, 12" off a BX1505d, 12" off Alpine MRD-1000, Two 12" off BX1505d, Two 12" off MTX 1501d(or similar), Two 12" off KX2500, 15" off BX1505d.
Time and time again when I install them for people I set them up the same way, and throw 1000wrms to them over and over, but I always tell them to be careful.
Most of my experience with them has been with the 12", even more so than the few examples I listed.