I upgraded and I've not long received my Go++, (after around 2 month delay) but in the few weeks I have had it.. I would say the performance is a bit Meh. It arrived just in time realistically as my Air max battery was starting to struggle with holding its capacity. After 3 years of nearly daily use and charging it was almost time to consider replacing the battery. I had the Max Air previous, and while it's nice not to have the block on the handle bar, the Go++ is an almighty chunk of a block that you attach to your frame. Seriously you need a Motor just to carry it.. there's got to be lighter materials for a battery... The plus side is I don't have to worry about charging it up everyday, if I forget then it's got plenty of charge. I only use the bike when I'm commuting to and from work which is about 6/7 miles per day, and I've used perhaps 1/3 of the charge on the battery after 2 days. The straps that attach it to the frame are again fairly straight forward but not the best if you wear gloves, one of the pluses of the Air was it was simple to connect and secure with or without gloves. Biggest issue with the UK kit (and I think Spain as well) is the local speed restrictions. The Go++ is internally restricted to 25kph (15.5mph), theres stickers attached to the battery when you first get it, obviously there's at least 2 different versions of the same battery, and aside from an occasional push to 18mph it then throttles the speed whilst your peddling*. Its almost like it applies a whole lot of extra weight to slow you down (presumably the electromagnet in the motor). * It doesn't apply when your freewheeling I have found that cycling in 15th Gear means I'm largely in that sweet spot where I'm cycling slow enough that the motor doesn't slow me down and I don't have to work to hard. 18th and 21st gears causes vibrations in the motor, where it's a fight between the restriction and the motor to go faster which causes an interesting sensation. Oh and one of the negatives is that in this particular model they haven't changed the connection to the USB-C like they have with the recent redesign to the Air max. So you have to use the charger and plug that they provide. It will likely be the last one I buy for a while, at least until some new battery materials become available and it becomes lighter and holds a longer charge and range.