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I wouldn't chance it, the seller can quite easily vanish from ebay. If it becomes more trouble than it's worth for him with customer returns I really wouldn't put it past him to quit while he's ahead.
That could be said for ANYONE on eBay, loads of people have bought these monitors and had no problem with them. The whole reason why there cheap is because there defected and if you buy one not realising this then more fool you.
I don't think i've heard of a single horror story from anyone who has had to contact the sellers of this or any of the variant models after purchase.