I've used the Maxi series in both hydro and soil grows and have been very happy with the results. I agree with the other comments here about needing to add some Grow to the Bloom. I usually add somewhere between 1/4 to 1/2 tsp Grow per four gallons to keep the plants lush and green.
A long time ago I spoke to the chemist at GH who said the Maxi series was "undervalued" by most growers. Nowadays everyone wants a liquid fertilizer, but he thought Maxi was a quality nutrient that's easy to use and a fraction of the price. Of course GH and all the other nutrient companies are happy to charge a premium for liquid nutrients that are mostly water, but for some reason growers seem to think liquid fertilizer is more advanced or that mixing a dry nutrient is hard. Except for the need to add Grow to the Bloom nutrient I agree that Maxi is awesome stuff.
I get a good laugh reading product labels at my local hydro store. There's so much marketing hype out there it's completely out of control. My favorite examples of this are PurpleMaxx (dude, like, it might work, we don't really know, but we're still gonna charge $60/quart) and Kushie Kush (utilizes the unique metabolic pathways of the kush plant. Ha ha ha, you guys crack me up, if you figured that out where's your Nobel prize?)
There's lots of ways to waste your money if you're going to fall for fancy labels and scientific sounding mumbo jumbo, but products that are unique or give a real advantage are few and far between.