Great motor, but lackluster runtimes. When they say "it takes advantage of the new higher capacity cells", it actually means "you need the higher capacity cells if you want to finish the race".
I'm not bashing it... just not a good practice motor. I practice with my Monster Stock (medium-sized track, not much torque needed on current layout) and then throw my Co27 in for a warmup and then the heats/main.
One thing is for certain, the other motors are at a significant disadvantage when up against a Co27. As soon as one person shows up with one at your track, everyone is pretty much going to need one. The difference is that noticable.