the SX12 is probably one of the best GM speedies around. If you have the GM commander charger you can use it to program the ESC. That is the feature I love most about the SX12. It is more updated the V12. Check it out. Everything that I have bought that is GM is top notch equipment except the battery case (not there faught) because it is just a re-badge of some elses design. But if you buy a GM Speedie it will give you what you crave. I have used the Quatum Comp2 for awhile and I love it but the SX12 has a better programing for stock and 19t which is what I run most. Now for the MOD motors the GM has a very high continuious amp rate.
HTH
Stephen <><