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I know that my friends who play mid and high stakes all use these and one of them had his account hacked and taken for a "joy ride" @ 5K NL before he got one. I'd say it's probably not something you need to worry about while starting at micros as the risk/reward for a hacker to target a microstakes account is pretty bad for them. However, Once you start to have a significant amount of money it's certainly worth investing in one. I just got one myself as the amount of money in my account has become significant enough for me.