Just reading through this and wanted to add my experience. I bought a sure speed 17.5 last fall for indoors in my sc6. At the time was very happy with the power. Then a friend's kid turned me on to team scream.In 17.5 blinky it was immediately faster. A few days ago I purchased a 13.5 for my stadium truck and it too was very good. When I move to mod sc I will start with their 10.5 motor. Quality is top notch and service via online has been exceptional. I live and race in Fantom's back yard so we see a lot of good motors here. IMO tsr is very strong.