I race the Novak 5800. I have used it in stock and full speed. Duratrax is right about the cut in and out feeling. It runs good though. My track allows brushless and and stock brushed motors together so long as the brushless is tuned down to stock. A few guys use the brushless 5800.
I like the torque, but I don't like the cut in and out at in opportune points. Sometimes it can mess up your line when it cuts off the RPM then cuts back in while in stock mode. It's something that takes a little getting used to. When you get it down and learn how it operates on your track it's worth having.
No maintenance, smooth power, and long running.
Good luck with your decision.