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I have had one long term relationship with one and had dated (very short term) about 1/2 dozen more in my late teens and early twenties.
Usually, they are amazing in bed; aggressive, adventurous, and primal. Also, they are a blast to hang out with-when they're on.
When they're off, they are, at best an emotional mess, at worst downright scary. It is possible that she may even turn violent. You have to get very good at reading people to avoid ending up in a bad situation.
This is just my experience, make your own decisions.