I'm a bit late to the thread but I figured I'd still leave my experience for anybody coming across this who are considering using this seller. I also want to point out that this occurred with a GPD order and had nothing to do with that GCW failure, yet he still did some very shady shit when pressed about the GPD and then the refund. If you're reading this and considering a pre-order through him, don't waste your time. You'll be better off paying the ~$20 or so more any real seller will be charging to actually get your product.
I purchased a GPD from him around the time he was having problems with his GCW pre-orders. He claimed he was about to order the next shipment from GPD within the next 4-5 days from when I paid, around September 12th, and would be shipping them to customers around the 23rd of that month. I heard nothing more and contacted him on the 23rd about it and he had still not even ordered the units from GPD, so I was unable to get the red model I originally ordered through him because it was discontinued by then. I was lenient and gave him more time to get a black model, then contacted him yet again after hearing nothing on September 29th with no reply, then again on October 9th where he very briefly replied about a partial refund but gave no update on the order. Contacted him again on the 11th and 12th, after his profile showed he had logged in both those days so he had to have seen the messages but ignored them because I was asking when my GPD would ship. Finally had to file a complaint through Paypal around the 14th when I found out about the GCW problem and realize he had probably given my money to someone else and hadn't ever even ordered the GPD. Finally got a refund on the 21st of October, all the while he ignored the attempts to message him on here and never replied about the matter in the paypal resolution center.