I personally never really liked the look of the flexy rack. Its concept is neat but unless you really think you'd be changing your equipment all the time and think that having adjustability is that important. As long as all the force is downwards all the time you are safe, but offset the load and things can come crashing down rather quickly.
I have changed some things of mine but am pretty confident now that what I have is what is going to say for quite a bit so I made mine solid. Floating tempered glass shelves, but put some thought into how to keep the wiring neat, and structured channels for the to run down.
side view
view from rear
now I have to start thinking of putting up the rest of the baseboards and getting somewhere to store my boxes that I want to keep
