I just bought a HL Pershing S and S full metal upgrades from Phil at RCTANKWARS.COM. He has taken the time to explain many thing with this. As always in RC Hobby customer support is the most important thing for me and Phil is top notch in my book. I am sure RC COMMAND is good but haven' had any dealing with them so I can't give pros or cons. But again I am a newbie to RC Tanks (Not RCing) and Phil is friendly, knowledgable, and goes out of his way to help.

Good luck with whatever you decide.