I got my Novak HV4.5 into the E-Revo over Christmas. It was really easy to install and just dropped straight in, my Mardave pinions offered a good range of gearing.
Performance is pretty damn ace, although not quite as sparkling as I was expecting, it certainly handles the power well, rolling wheelies are no trouble, the wing is a brilliant wheelie bar, but I've been unable to do standing backflips

. I can only get it up into the air then back on its roof. I think the Novak + LiPos should do it, the LiPos may need a few more cycles before they can deliver the power. Anyway what better way to get some cycles on the packs than a New Year's BMX session.
Here's a sweet jump, backflips were easier once airborne, one hand driving one hand filming

:
http://uk.youtube.com/watch?v=XXauMGKDtZM
Probably some of the most fun I've ever had driving, the truck puts the power down and handles the jumps so well.
Total damage from the biggest jumps I've ever done: one bent body clip. I took the wing off.
