Hi Dan:
I've used them in the past and am using some at present. I have used it and Fox Farms, and to tell the truth, I can't tell much difference. I've been using the Earth Juice catalyst for the last two crops and it's really amazing -- the older leaves don't yellow and die. The old leaves wear out, but don't fade away.
Really, Budswell and guanos, plus FF bulb food have kept me in business without spending much cash. And the taste of the herb is so sweet.
BUBBA