Pierre330 wrote:"NeckUp is attached via a suction cup and an adjustable endpin tab or two suction cups if there is no endpin. "
Yes. I think that was a later-added feature.
FWIW, I also have a large Dynarette which I've kept. I bring it along to luthier's shops whenever I need to evaluate guitars. I seldom use it for anything else. I gave away my small Dynarette to a relative who sometimes uses it with a low footstool.
I've found the Gitano and the Ergoplays to be my supports of preference. I sometimes want my guitars adjusted to sit higher and to have a steeper neck angle and the Ergoplays are excellent for those needs. Also, by leaving the Ergoplays/Gitano attached to my guitars, I'm able to just grab them off their hangers and start playing. I enjoy that convenience.