Spent the past month thinking that I for sure got scammed on an order from Haizenberg on SR2 (first order, huge noob). The guys communication was absolutely horrible during the resolution process. He said that he would give me a refund about 40 days after I placed my order and never did. 50 days...50 freaking days after I place my order, I get a letter from the czech republic and lo and behold, Haizenberg has delivered. I haven't tested the quality of his product - other than marquis and mandelin reagent tests which went straight to black. However, all things considered (horrible communication, slow shipping times, selective scamming history) I would stay away from this vendor.
I got scammed from him maybe 5 months ago. I order from him on some marketplace (I can't remember which one it was) was taking weeks to arrive. I was about to contact him to see if anything would be resolved but the market went down so I had no way of communicating with him.