I was getting the r, then went for dualsky. The motor will go straight with the esc, speed passion are actually a great brand (their motors are excellent) its just the reventon r is awful. Savox servos do draw high currents, and that can cause issues, but many use them without issue. You can buy a usb programmer or box too, I would recommend the box as you can adjust trackside. Just to ask, what car is this going in? I could help you a bit further then with cells etc.
Hope this helps.
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