I purchased Kingsong 14″ with 840wh battery from Jason of ewheels.com a few months ago. I had already been riding a kingsong wheel for a while, and with about 3000 km under my belt, there have been quite a few occasions when i needed some support. It was amazing that Jason helped me each and every time and not only with the wheel i bought from him but also with other kingsong wheels i owned. This has been a fantastic experience all around – my other wheel needed a control board replacement and Jason came through for me and provided a new control board so that i didnt have to wait a long time to receive it from China and pay for shipping. He certainly didn’t have to do that! I felt a bit uncomfortable because he didnt even ask me to pay for the shipping from his warehouse in florida! He also swapped a wheel for a new one for me when i had a concern about a very minor item. No matter how difficult a customer i may have been, he never complained and always helped. I would definitely order from him again because i am sure that if, god forbid, the wheel ever needs warranty service, Jason will stand behind his product, because, unlike many other distributors, he understands that this business is built on referrals – indeed, i have recommended his website to many people who are fascinated watching me fly by them every night on my way home from work and ask me where they can find a wheel like this. If you choose ewheels you can count on their high professionalism, profound knowledge, a very smooth and secure transaction, great product, unparalleled customer support, super fast response to any questions, and a fun experience all around!