I got my MIM P from them a couple of years back. No problems, but as with any Internet box shifter, they do not check what the condition of the item is in the box. They can't, it would destroy what little profit margin they have left at those prices. Any reputable shop will check AND do a basic set up of what's on their wall, and that's the justification, along with the other overheads, for the greater price. There's no point in buying from the net unless you can do your own setup, as the cost of having this done afterward will more than likely erase any savings made in the first place. OK, I'm biased, I work in a guitar shop, but we don't sell the cheapest guitar without it getting a once-over. GAK or Thomann cannot offer this level of service, and never will be able to, without extra cost.
Also, I know that if you bought something from GAK online and it went wrong, you cannot take it into the shop for fixing, even if you live next door - you MUST send it back by courier. The way the system works for their pricing demands it, they're not just being awkward. Crazy, but true...