Yeah, not sure why no one is answering you....too busy, you know?
Mother Earth Super Tea is a pretty good product, though I'm not as hardcore about organics as I once was. From people I've known, they've said that this tea is far better than anything they would have made on their own since it's more consistent. I know that when I used to make teas for my grows, they would work sometimes, but not other times. Human error, I guess.
Advanced Nutrients just has a good reputation for looking at their products and improving them so that they can be as good as possible for MJ grows. To me, that makes sense - a product that's only for growing certain plants.
I've heard nothing but good things about the tea, though I'm sure you're going to get some whiny folks on here saying that it's too expensive. But, IMHO, convenience is worth it and their reputation is solid to me.
good luck!