I really believe that the design of the Hisun 500/700 is very good but the people building them are very bad. They apparently know nothing (or just don't care) about quality control and customer support. If a good company were to buy them out and fire everyone that ever had anything to do with building them and replace with good engineers, QC, customer support people, they could corner the market. As it is now don't buy one unless you are fully ready to maintain it on your own because you will have problems.