There sure are a lot of us who did them. My information will be squed as I did not have a 100% set up and stable system for other features at the time and have more upgrades on the go.
As for my impressions, I love the fact that they are stream lined. My set up is less then 1" thick. The coverage is great even though I am only about 2" above the water line with no optics. Growth is there, however, the slow speed of growth is most likely due to the water quality. I am currently only dosing vodka. I will be adding GFO and biopellets in the next few weeks and slowly adding that to the system. Hopefully all will take off at that point.