wilma 8 pot system

has anybody any experience with this system was thinking of getting 3 of these they would fit fairly snug in my flower room under 3 x 600w hps its bout 7ft x 7ft.
wondering what size you flower at in these systems[was thinking bout 25-30cm] and what kind of yeilds they are putting out given all the right conditions?

does anyone know bout these setups

i have a 4 pot system but haven't used it bro staying with my iws flood and drain as the pots look abit close for my i like to put some room between my plants as i have been told you get a better crop