I have had only a short time with my new SC104x4, and the Viper VST 550L motor. I used this combo this past weekend in the 2011 Georgia Championship Series Finals. The finals were held in Loganville, GA. The track was just totally changed a week ago, and suffered alot of rain during the week, and more during saturdays qualifiers, but it held up well and for mains it was grooved and high traction, oh and they weather was very hot as well, pushing close to 100 degrees. The Viper VTX10R and 550L motor ran flawlessly all weekend. I am still trying new things with the truck to make it better, and it does keep getting better. In Quals I had a 2nd, 2nd, and 1st. I started 4th on the grid for the triple A-Mains. A1 I had a good run but made some costly mistakes and ended up 5th. A2 I had a very rough start, ending up next to last at end of first lap....battled my way back to finish 5th. A3 I had a strong start and battled for 3rd for a long time, and with 2 minutes left I started pushing much harder and managed to finish 2nd. We had a tie for 3rd overall, and the tie breaker put me 4th, only missing 3rd by under 3 seconds. Overall for the 2011 Series Points I was able to bring home 4th. Not a bad finish to the series. The VTX10r never got hot and never faulted me, as it never has since I started running Viper esc's. The 550L is a little overgears, running a little boost, and even on a hot day, after 10min, it was just over 150 degrees and never showed any lack of power or speed. The track had 2 long straights where the 4.5 motors did shine over my 5.5, but the 5.5 still hung strong.