Horrible. Absolutely horrible. The site itself looks kinda sketchy, which is why I was wary of purchasing from them in the first place, but the site that I normally bought from (fastwowgold.com) was out of stock on my realm.
I purchased 50,000 gold from them, a decent amount, not crazy high but high enough. 3 hours later my auctions still weren't purchased, so I decided to open up the customer support window and ask how long they expect it to be. The person I talked to took forever to respond to me, and after requesting all the information that I had already given them, they finally said "we are currently out of stock".
I went back to their site, and it said "In stock". I confronted them with that fact and they never responded, after about 30 minutes I closed the tab and started a new one. Same person. I closed it again in frustration.
About 5 minutes later I opened it again, yet again same person "Rubby Mao". I asked them if they would be willing to give me a refund and they said "refunds typically take 2-10 days". I then asked when they would be in stock, no response. I then asked "did you send in the refund, or do I still need to wait for you to be in stock?" no response.
DO NOT BUY FROM THEM UNDER ANY CIRCUMSTANCE.
I would recommend fastwowgold.com it's much more professional, but are slightly more expensive and are less stocked. Well worth it considering you will actually get your gold.