never used it, i realize it is just bacteria in a bottle, but i will stand by the old addage that:
"THE ONLY THING THAT HAPPENS FAST IN SW AQUARIUMS IS BAD",
i have had good results cycling with lr and ls, and if you use cured rock(enough of it) it generally goes real fast anyway, we have been adding fish in little as 2 weeks, cycle was over in @ one, and our systems are stable when complete, whenever we added bacteria, it only seemed to be that could be spent on something else
oh yeah, shrimp will also help with the cycle
HTH and good luck