Actually did/do like the Flora Flex. They came out with more additives, but I only used the basics and had really good runs. Tried Mega cause Main O Green and then switched to Jacks as it was cheaper and proven. Seemed that Mega was changing their formulas every year. Mega and Jacks are pretty much the same as far as their two part.
I know The Devil and Green Bean have used Jacks and one of the old school people(can't remember name at the moment, but it's something pig related and has an ongoing grow thread) uses the one part