SunPoker, formerly known as Caribbean Sun Poker, is owned by Peak Entertainment, the operator of several online casinos, and runs on software provided by Cryptologic. This means it uses the same network of players as more recognized rooms such as William Hill and Interpoker. The Cryptologic network isn't as large as the Prima network or the old Party network, but it's known for being relatively stable and having a good-sized player base. Being a part of a well-established network of poker rooms definitely works to SunPoker's advantage.