They rip you off with cutting their FOs so when you purchase the "extreme" concentrates, they are usually the same as the regular concentrates from most other suppliers at usually more than double the cost. They also messed up my order and said they would send some free samples for my inconvenience but that never happend and when I asked about it, they said they would make certain to send them right out and still nothing. With that said, they offer some hard-to-find FOs.