I've order several parts through their website recently as well and all has been great. I did have a small issue when I ordered a part from them through there eBay site, but it got resolved quickly.
I know they are transitioning out of dealing with PayPal through eBay, so I know that has slowed them down a bit on the PayPal side and dealing with customer orders through eBay. I've talked to Brian as well, just through email on the eBay side and he's responded very quickly. Customer service at Gbodyparts also has responded quickly as well when I recently had to return an item. I wouldn't worry. Worse case just message Brian through eBay if you can't get a hold of anyone. His screen name is "Bweavy." He's been great to deal work with.