I am using it to cycle two new tanks. Here is my experiance so far (Both tanks are around 86 degrees for optimal bacteria growth)
Added Biospira and dosed ammonia to 2ppm, noticed around day 2 some nitrites, and day 3 some nitrates. This is day 5 and its going well. I add ammonia when needed to replace what was naturally consumed. I suspect it will be cycled in a few more days, no longer than a week.