You can get at least some idea of what sort of trader BF is by taking a trial in his chatroom. He's much "looser" than I like, particularly about stops, or used to be, which is why I didn't stay. But I sure wouldn't be handing over any money to anybody unless he can provide you with a verified trading record.
This depends, of course, on what you want. If psychological issues are your problem, then it doesn't matter whether your "mentor" can trade his way out of a paper bag. You also have to decide whether you want somebody to help you develop a strategy of your own or you want to copy somebody else (which is rarely successful and will be a waste of your money, but it's your money and your "mentor" is unlikely to turn it down or give it back).