I don't know why there are such bad ratings.
I've bought many times over the last few years from this guy and can't say anything bad about him.
Good quality, good prices, fast delivery, good and fast communication... And in the case I bought some lab equip and the glass arrived broken I got replace as fast as possible.
no contact, no money, no product. Now its over 1 Month, he tell me on the beginning sometimes, sorry sorry, trouble i will send soon. But now the last week"s" no contact to the seller :/