I'm thinking about putting together a TLR 22 rig and I'm looking for a good ESC/Motor combo. The 'richie rich' type guys at the track are recommending a Tekin RS pro sensored ESC/Moto combo which run about $300. I think I'm going to want a sensored system for smoothness and Speed passion has a 13.5 system for 1/3 the price of the Tekin. What exactly am I giving up on other than an extra $200 in my pocket?