Eventhough it does take some time to figure out how to set it up, once that's done, it's a really useful and easy to use tool.
We just released ZOOtools, a free extension that has a folding feature. Perfect to organize better all those multi-elements :)
Directly after the release of Zoo 2.5 Zoolanders issued a beta version of their filter, which had some minor issues.
They showed to have very customer friendly support and went out of their way to solve the issues. Thumbs up for these guys.