At a minimum, thus run of GP7s is likely far enough along in the process that any change at this point is not going to happen. I think at $225ish (Ro and Trainworld) it's a relatively low risk gamble on giving one of these a shot. I can't see most people pulling more than 10 or 12 cars with it, I think even with one motor it will do fine.
Bluetooth + sound = a win. I would like smoke, but I'll live without it.
Now this could be a good starting point for a RTR set.
Ben