It's easy to use, it can be used in different languages with no problem at all! The interface could have more options like "Send" button instead only two colors (red or green) buttons that are not so clear as well. Also there should be an option where you don't need to enter your email address every time when adding/removing people from chat list because this part isn’t very intuitive if I'm honest; maybe they will fix these things soon? There shouldn´t exist any restrictions regarding group size either - just do what works best for everyone involved :) Try them out first before paying anything but their pricing plan might work fine without needing additional plans later since each user has his own profile which means he won't get bored easily by having too many users inside one account. We've been using colabs together during some projects we worked with. This.