I tried AG, and the main problems I have found are:
1. The holes are big enough for the stems once the plant gets large.
2. the pills are are junk, I use general hydroponics 2 part nutes.
3. lights do not go high enough, I cut the wire to the lights. by cutting the wire and giving the lights their power you can add a timer and hang the light form something to get more room.
4. 2 plants will completely fill the reservoir with roots.
5. after the plants get big it's a huge pain in the ass to empty the reservoir, I drilled ahole in the side and and added a drain.
I have tried three times, using bc kush seeds only to have them die when I flipped them to 12/12. They were really nice looking big healthy plants.
I now use the AG for starting plants and cloning. I switched to sunleaves garden of ease for vegging and flowering......