I personally didn't like the medusa in my Rustler, as the motor lacks in the topend. It just didn't have the umph I am used to with my other motors. The neu is a better motor for sure. The medusa did very well in my crt.5 running a short oval as it topped out quickly.
Here's a vid of the medusa 4800 in a crt.5 on 4s A123. Keeps up with onroad cars.
http://www.youtube.com/watch?v=V6Vg9Ec9-Kg
6 KiloWatt A123 Racer
GTP-Pletty Big Maxximum+RX8. GTP-C50-6L Hacker+RX8. CRT.5-Pro4+ZTW esc.
24s2p EVG SX 49.6mph Ebike.
18s4p Raptor 60mph Ebike. 11.5KW