so what is it about the 4010 that I would need over the 106b+ for club race charging? I run 1 class and my kid runs novice. So I only need to charge 2 packs per hour. The 106b+ is known to be one of the most accurate chargers for balancing. It does IR, 10amps and its extremely easy to get new balance leads if needed. The ONLY downside to the 106b+ is the button that eventually starts being stubborn. The most trouble free charger I have owned is the tp610. It does not do IR, but charges and balances just as fast as the 106b and i have verified that its balances very accurately. I know guys that use the 4010 to the most of its abilities, but I am not willing to do the 40amp charge discharge stuff anymore. It was killing packs. I disliked getting my packs to 118 deg and watching the swell. And puffed packs dont fit in my b5 very good at all with a CF battery strap. I know I am down grading. And if I ever need the features of the 4010 again, I will probably just get a 406 since its smaller.