im never impressed with the vertical grow systems
they do not have the flexibility of moving the lights
plants have to be small sog is the only way but im old fahioned and like my plants oin the level, i have dual layerd tanks {double decker style} and 35 in each meter square!much easier to control
irrigation systems can be a bit troublesome too at times with there drippers blocking etc not alot of room to work in iether
pluss another draw back is that they have to GROW and flower in the same place
means 10 wk minimum crop cycle
1n 5meters square i can have the same area and only three meters on the floor!.. the versitility of having multiple lamps is a good one too .... heat controll is better! and crop rotation is faster

four meters flowering and two meters in grow WILL produce more quicker better!
thanks
bye