I don't know. One of the things that I hated about nitro was the clutch and the associated maintenance. It seems to me that this sort of conversion would take clutch maintenance to a new level, with the stress that the brushless will put on it.

On the other hand, they say that their conversion (battery tray) will fit either a 3S 8Ah pack or a 4S 6Ah pack. If you stick to these battery configurations with a 1515/2.5d, it might not be too insane. I consider a 1515 2.5d on 4S to be a pretty mild setup.