This was our issue with Enhanced, as demonstrated by this thread.
Some people, myself included rated it as one of the best pre workouts ever made. I loved that I could use a whole tub and not need to change the dosage, unlike a lot of other stimulants. It was also nice that if I took a break and went back to it, it would hit me as hard as it did the first time I took it (unlike DMAA, irrespective of how long I took away from it).
Unfortunately, some people just reacted very poorly to it. Sometimes due to sensitivity to yohimbe and sometimes simplynot assessing tolerance first.
Either way, it was our most complained about product so we made the decision to discontinue it.
One of the big issues with pre workout products is fighting the battle between using strong enough stimulants that people want to buy it yet stay compliant. As a category it is all too common for people to rate products which are nothing more than a blend of non compliant stimulants in a tub lol.