4wd SC across the board is very interesting, and difficult (in my mind) from the mfg point of view. The majority of the vehicles are heavy, they put a big strand on a system with 2s, pushing all that weight around. Add on top of that, the desire by many to be overpowered (because when all else fails - pull the throttle!!!). I was having a discussion about this today with one of our team drivers and we kind of came to this type of a conclusion:

Copperhead system - awesome price!!!!, can't count that out. 4 pole power, little lag, because its sensorless, not as bad as similar type of units (especially when set right), helps on loose conditions (slight lag almost acts like a little limiter). again, great price point for the power

VTX8 - with 2 pole or 4 pole motor
2 550 Pole motor -- indoors, medium - smaller, more technical, smooth track. Much better throttle control, bigger tracks - hard packed, loose top. Similar top speed, but not wheel spinning grunt, probably better for smoother driver

4 Pole motor -- grunt, power, want to over jump, wheels spinning, (the old Tim Allen TV show with him going - Arh, Arh, Arh come to mind, unless I am showing my age), short run ups, long jumps, outdoor 1/8 tracks.

I didn't list the VTX10R here, although many of our drivers are using it with 2 pole motors because, the 550 motor is pushing the upper limit, now that we have the VTX8 its a better option. Yes, because its more stable, those who are inclined could even look at boosting the 2 pole motors. We have several drivers who do that now as well.

We have always been about options - as you can see, we continue that. Our 4 pole motors are in final development, once I have a clear idea on release -- trust me -- everyone will know.