The KQi3 Max is a small upgrade over the KQi3 Pro I tested last year. They're nearly identical, from the design to the components, but the pricier Max has a slightly more powerful motor, weighs a smidge more, and has a larger battery capacity. The Pro is enough for most people, but if you're in a hillier area or you're a heavier rider, it might be worth spending the extra $200 on the added power.