I forgot to mention there is no losing sync or cogging!
I have pretty noticable acceleration. I have to put one of my feet on the back and push myself forward or else I fall backwards.
And last night I went to test it after I charged the batteries, and it didn't turn on. I think the servo tester is getting too much voltage, the battery is around 12.5v. I'll need a new way to power the servo tester. I'll have to use a bec, especially after I get lipos.