I too can attest to owning two Onstage Two Tier Z Stands, but I cannot in all honesty attest to their portability as I've only moved them a handful of times over the years.
They break down quite compactly, but it definitely is a far more involved process than simply folding up a table stand or simple one tier Z.
For a single tier though, it should be doable in under 2 minutes with practice.
As for weight rating? I could rebuild a Toyota Engine Block on one of these things. No matter how hard I pound the keys, the boards never vibrate or jiggle.
Width is also independently adjustable from height, as it should be.
I have nothing but praise for them, but as I said, mine sit in a studio and never go anywhere.
Gary
