This was my upgrade battery to the Goplus battery having previously had the AirMax battery. The battery is better from a capacity point of view, but they have altered the control software on this unit. It's no where as responsive and smooth as the original Airmax was. If you have never had the previous hardware you probably wouldn't know and think it's great. I have been riding my previous swytch conversion for a number of years so can feel the differences. It's typical of a company tweaking and messing with stuff, probably in a bid to maximise profits at the customers expense. I will adapt but will never be 100% happy with this. 3 Stars for the above mentioned, plus late delivery, 6 months waiting time when you pre order and emails near delivery date telling you to hang on longer, when I can buy from amazon with a week's delivery. Again money rules, the pre order saves you some money, but customer service goes out the window once they have your cash.