So I am always a bit critical when it comes to collaboration Apps - so take all I say with a groin of Salt. - A Lot of stuff is just so Important.
Mazey does get good points with how it is organized and the look & feel in the UI is great. Also the possibility of multiple Groups is really nice.
Sadly I don't see a WebApp which is almost a dealbreaker for me, even for Private stuff. A Collaboration app I can't use on my PC? - Does not make sense for me personally.
As always with these Apps security is on the downside, no encrypted chats or files - everything open for the Admins to see. But in the End it is free so you can't expect encrypted collaboration.
Not sutable for EU-Business but maybe something we can look at a later time again.
Love the constant improvement in the tool. The interface is clean and simple and keeps collaboration efficient. Curious to see how the UI scales with new features.