I had one 17T. I was able to run ~ 10 packs until it started to act all weird. I opened it and armature wires were all burnt and blackened.
Couple other guys from our club ordered these motors too in same order as I and all these motors have had exactly same problems, but others just didn't stop in time using them. I think we have had total 5 of these (2 x 17T, 2 x 15T and one 13T I guess) and all others than mine have burned too, but with smoke coming out at the same time.
I cannot recommend these motors, but maybe we just had ours from a bad batch. Just start with a lot shorter ratio than normally and maybe it will run fine. I remember that this motor didn't have much torque anyways.
Some months ago I tried LRP 17T armature with this motor's can and endbell with CS PowerMax brushes and it worked quite nicely. I used shorter ratio than with my other 17T motors because it seemed to have quite less torque (vs Matrix TI with same brushes for example), but performance on the track was still quite competitive.