In 2007 I was diagnosed with Cancer, stopped flying commercially and needed something to do as a hobby. My brother in law showed me a bicycle he was putting together with a 2 cycle engine. I looked up the information and ordered a kit from Boygofast. I put it together and was so pleased I ordered 3 more kits. I put together 2 more bicycles and sold them. I ended up giving my brother in law the other engine in exchange for some mechanical work to my car. In the time frame that I was doing this I ordered several parts from this company and got very fast shipments. I still have my bike and ride it once in a while. I had it stored for a whole year and it fired right up. I think they sell kits as good as any other and I never had a problem with them answering my emails. I have no complaints and if I was to order another one I would not hesitate to order from them, plus the price you can not beat. I hope this helps any undecided buyers.