i use bio bizz grow and bloom with good results but was talked into buying some EJ catalyst at my local growshop, apparently it works well with most other organic nute line ups but still havnt used it yet but yes it absolutely wreaks! i have read reviews on other forums where growers say the npk ratios can vary from bottle to bottle, and some batches burn the shit out of their plants at less than half the reccomended dose and other batches where growers are using full strength doses and gettin serious N and K deficiencies, how true these reviews are i dunno but i will be trying out the catalyst soon.