Many items are listed with no shipping price. You have to order then wait for an invoice before you know how much it will cost.
The first time I ordered a record I waited a few days, got the invoice and paid it. However it looked like the payment didn't go through so I paid again. I looked at my Paypal account and it turned out I had sent two payments. This is the first time this has happened to me on any site. If this happened on eBay you would get a message saying you had already paid. The fact that you can pay for an item more than once is ridiculous. I can't think of any other site where this could happen.
I gave them another chance and thought this wouldn't happen again. I paid for a record and a few hours later got an invoice even though I'd already paid. This site is confusing as hell and not remotely user friendly. If and when I figure out what's happening with this record I think I'll quit while I'm ahead and delete my account.
One more thing - there are no pictures of the actual item you're buying. You just have to hope the seller is being honest when he/she says the item is in excellent condition.
Update - to add to the above, the users in the forum are very rude, or at least the ones that replied to my query. I was told "the problem is in front of the computer", the meaning being that I'm an idiot who can't operate a computer. No, the problem is the site. I've ordered hundreds of items online and I have never come across another site that would even let you pay for an item twice. Also I offered a criticism of the website, not of any of the members, and I don't appreciate personal insults.