Lowie, DCM and the others are right. If there's a sensored port on the esc it's the RS.
If you have the RS you can run both sensored and sensorless motors. The fact that was also stated corretly was that with the RS you have the ability to choose between Sensored only drive OR Dual mode which is a sensored start and sensorless operation afterwards.
My personal current ride is a BJ4WE with either the Tekin Redline 6.5 or the 5.5 depending on traction. When setup properly I'd put our 6.5 up agains most others 5.5s. The Hotwire gives us an advantage over the others with easy tuning, updating your software, and soon user programable/storable throttle profiles.
When we make an improvement, you only need to download the FREE software, not a new esc.
Jimmy, thanks for making it a sticky it's much appreciated. Hit me up when you get time:
Rpike@teamtekin.com
Sorry for the delayed response guys I had the wrong email listed.