The Viper line has proven to be great. I find that the motors are silky smooth and are just plain easy to drive. I was fortunate enough to win the J Concepts race at LIR in the 13.5 Buggy class with one. I am also fortunate enough to be on the team. Weylin is a great guy and is always there if you have any questions. I was sent a pre production esc that I will be testing tonight in my SC truck at LIR. From what I have heard the guys that have been testing them have loved them so I am highly excited to test it tonight. I look forward to running all of my Viper stuff in 2011 and now it is on to Motorama. If anyone has any questions about what I have been running feel free to shoot me a pm.