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I believe BetDSI has been around the longest. They are in Costa Rica, and operate out of a real casino. It's not just a call center, like most of these sites. Many sites have just closed down and absconded with people's money. BetDSI not likely to do that, since they are a physical Vegas style casino, and have been going since 1998. I would stay away from any "new" sites in Europe. They can go out of business @ any time, and you will lose your deposit.