I had so similar situation half year ago. Ordered one on e-bay and later seller fools with "delivery problems" (denied to provide tracking number and deliver company) what finished with refund. I was extremely nervous and trying to analyze e-bay x700 clone market. There are many sellers of x700 clone in EU and looks like they are "professional sellers of all goods" from diapers to lasers. Look at the company details, tel numbers and addresses. They are tied in thick network. Even ads are done from same template graphics and sentences. In my opinion there is NO better or worse sellers - most of them (x700 clone) are not professional and after-sale support is a miserable. Mentioned laser itself is a working, but need a lot of work to tinker it and is not straight forward in many cases. Moreover in my opinion there are construction/design glitches which makes this tool hard to use/setup. Actually in my particular case there should be replaced: mirrors and 1 or 2 holders, lens, lens holder (size/dimension/quality), water pump (too weak), exhaust(loud and huge power consumption), air assist (too weak), inside lightning, grounding, drive (should be re-designed), back cover (loose), switches and sockets (poor quality), labeling (misleading). For 60W model as well tube. Maybe more. With some of them you can start, but it is hard to use this as hard working tool. Probably this is reason company is hiding behind e-bay salesman. BUT in same price range (say +500 inc VAT&TAX) there is a no alternative for 700x500mm.