The MG stuff is okay. You'll see a lot of hate on the boards for it though.
One thing is it's really high in nitrogen. Not so good at the end of a grow cycle from what I understand. Just be careful using it. Remember most of the formula is one big scoop per 1.5 gallons. Not gallon. You'll burn em a little if you don't pay attention to that.
And from what I experienced using it is not to give it a full dose the first few times you use it. I burnt a few doing that with my very first attempt.
The second go I used the ''indoor plant'' directions the first week. Normal water as needed through the week
Then bumped it up 1 more little scoop per feeding/week until they could take the full dose. No problems after that. Just keep up with your watering and flushing cycles and don't deviate from them.
My schedule is hit em with a dose on Weds when the suns going down.
Water friday
Water again sunday
repeat. Had no setbacks when I got that little schedule figured out at all except from one girl. But shes small and thin as well. Have to be extra careful with her. She's stayed half the size of the other ones up until recently. Now she's hit a growth spurt and almost caught up with em in the last 4 weeks. She went into flower hardcore and started to bulk up quick and just went nuts.
Hope I helped though. Just remember to gradually go up to full strength. Not right off the bat