So far I like the waterfarm systems. I dont have any separate reservoir or controller. I just bought the two units and plugged each of the air pumps into a separate plug.

The waterfarms come with everything you need....Except for a meter that will tell you the PH and PPM (strength) of your nutrient solution. This almost killed my plants. I mixed the nutrients in the kit at the strength recommended by GH. My plants never seemed to really take to this...infact they showed signs of burning. When I finally bought a meter I found that my PPM was 1900 when it should have been closer to 500.

The other problem I am having with the waterfarms is figuring out the proper watering schedule. I started out with the air pumps on all the time. This left my plants looking way overwatered (and burnt due to the PPM). Yesterday I put the water on an hour on hour off timer and this didnt dry them out at all. Today I put them on a one hour on, two hours off watering schedule.