I have had a chance to run the sensored Beeman RC 2050kv and X8 ESC and I have to say I am impressed. The Motor and after running at full throttle for most of full 4s pack was only warm to the touch and the ESC was cool as a cucumber. Power was excellent I had no problem clearing any jump I wanted. Brakes worked really well bringing the buggy to a stop with no problems. Run time with my 4s 5200 60c battery was about 18min with the boost set at half, I was surprised at the length of run time I was thinking I might get 12min. All the program options are a nice thing to have, so I can adjust the power and braking as I need. The one big down fall to this setup is that Beeman as of now is only sold on EBAY so there is little to no support,but at the price of $150 us I can deal with it. As an added note it is water-resistant.
So If your on a tight budget and can get past the support problem, go for it! I can buy two sets for the price of a name brand motor.