I have experience with castle, hobbywing and toro. They all work pretty much the same. The fan in the castle esc doesn't kick on until about 150 degrees F. The hobbywing (HW) and toro esc's fan is on as soon as the switch on the esc turns on. I prefer the fan not to be on all the time because it drains the battery if it does and that means less run time. Since the fan is always on on the HW and toro esc, both runs cooler than the mmp. HW's auto lipo (where it automatically detects how many cells in a lipo you are running) can't auto detect correctly. The toro esc also has this feature and it can. The castle has this feature as well. Some Castle products come with a 1 yr warranty and their customer service is great.

If you're just bashing, the toro and HW will do but I'd recommend the toro.

If you're racing the tekin and castle is what I would recommend.

Besides tekin, Castle is one of the best in this industry.