Eh, I would never use Miracle Grow. It's just horrible for high grade MJ. I mean, if you're not picky about what you smoke, I'm sure it works fine, but from what I understand, it's really bad for MMJ especially since it has a lot of chemicals in it.
Something about smoking a plant that's had Miracle-Grow makes it really nasty on the lungs. But if that doesn't bug you, then don't worry about it.
It would bug me.
I'm actually an Advanced Nutrients fan, but I know not everyone can handle how strong they are. If you're interested in high quality smoke, I would check out AN the next chance you get.
From one grower to another, I think it outperforms Fox Farm, from what I've seen in friends' harvests. I've stuck with AN most of the time I've been growing, so I don't really have a lot of comparison.
It will be good to see what kind of results you get here. Share what happens here and everyone benefits - I mean, if you really see something special, we would all like to know.