In comp crawlers it's around a minimum 30kg (400oz) of torque, anything else is just a waste of money. Might seem like overkill but after you go up in torque you can never go back. I know for a fact that JRH has commented and said the only relation to the sidewinder is the case. I don't fancy going through the entire RCC forums to find where he posted that, but I remember it clearly. Neither the sidewinder or the new axial can handle 6s nor come close to the rock crawler specific programing or physical features of the HH they are different ESC's. The only pictures I can find right now of the board on the HH itself are a very very original proto that only recently gave up the ghost. Not much good for ID in comparison the a sidewinder.

Edit, I've had a bit more of a look I can't find any pictures of the brxl board for comparison sorry. Also sorry if I come across as a bit of a know it all. And finally don't underestimate the popularity of the BRXL, it's a very common ESC in crawling circles.

Kieren