I have had good luck with all but one of my engines and even that ones still runs. I have 4 TRX .15, 2 Ofna Force .25, 2 Duratrax Torq .21, 1 Torq .16, 1 Velocity .15 and 1 O.S Hyper .15. So as you can see I have been pretty lucky. I am going to spend some big money here soon (I am getting myself a SuperMaxx setup) and I would like to put a good solid engine on it. Something that is not too much money as most of my cash is going into the kit. I would like to have great low end and good top. The Ofna engines I have are not bad at either top end or low end but, I am looking to try something different. Any advice would be great.[8D]