Combo Nutes

Wassup...Im about to start a waterfarm grow and was looking into nutes. I came upon an combonation nute. Im wondering if its worth it or not?

Any brand...doesnt matter...just seeing if they are safe....and worthwhile.

http://www.texashydroponics.com/shop/Dutch-Master-One-Grow-Bloom-p-2280.html

Reading the product description it sounds pretty enticing. I have no experience with them, but considering you still have to have a bottle of grow and a bottle of bloom, you're only eliminating the labor of measuring out one bottle. I'd go with the traditional method unless someone can vouch for it...I'm curious.