The Novak is good for a descent amount of power and good customer service. Mine has been sent back 3 times and it has always been taken care of. The other companies like Hacker, Lehner, Kontronik and Aveox offer much more power but at a higher price. Right now there aren't too many good controllers for these systems. Schulze probably has the best with the U-Force 75 controller. It can run brushed or brushless motors, is splash proof and programmable. The schulze controller is more than the whole novak system, but can handle about 5 time the power of the novak controller and it is sensorless. I think novak needs to work on this even to power their own motor. The super sport controller gets quite hot without a fan. In my T3 I gear it around 87/17 and I probably need to go down on the pinion about 1 or 2 teeth still. The T3's gearbox ratio is 2.4 same as XXXT.
Systems that I own:
Aveox RC7 with L160 controller
Lehner Basic 4200 with Hacker Car sport controller
Novak Super sport 5800
The aveox has the most brute power, but the throttle response is weird for cars, go figure for an airplane company. The RC7 is only a 3800 rpm/v motor so it has to be geared high 87/22 to get speed. Motor is slightly oversized and uses 4-40 screws instead of 3mm.
The Lehner/Hacker combo was awesome, but my controller died last October and I am still waiting to get it back from Hacker. There are redesigning their stuff and someday the new ones will come out.
The Novak is more like running a brushed motor in terms of total power. Very smooth, but kind of lacks torque from mid-range to high end. Has to be geared low for anything but a huge track. 13:1 to 13.5:1 seems to be a good range to keep the controller temps under control (<170 F). Since I got my system back this time, it seems to run good. I have had more success on the offroad than onroad with it. It is also the cheapest system out there.
For now I would have to say that the Novak is the way to go since it is backed well by Novak and is an easy system to get running. For truely hardcore people with lots of money and the need for speed, other brushless systems will offer what novak doesn't.
Brushes? We don't need no stinking brushes!!!