Bubbl.us is the simplest way to brainstorm online. It's extremely easy to use and has almost no learning curve. Our intuitive user interface lets anyone brainstorm and organize ideas without getting in the way. You can share and work together with your friends, brainstorm without touching the mouse, display your ideas online or through e-mail, and print your work.
Extremely intuitive graphic user interface, visually attractive, solid/stable coding. Meets/exceeds virtually every need of a basic map. Very responsive customer support. Would love to have been able to give 5 stars but see cons.
It prints well from Firefox and Safari, but not at all from Chrome (customer support said that they are working on fixing this). The biggest problem however is that it completely lost a map (project). I hadn't yet upgraded my account, so I couldn't save to my local drive and thus lost the whole project. I can't risk that happening again, so I won't use it for anything important (ie, any project that takes more than a single session to complete).
Superb functionality for single session projects that don't depend on saving projects to their servers. Beware that servers can totally loose your files. Can easily be used with groups that don't have much experience with concept/mind mapping because the program/GUI is so intuitive and easy to use.
The visual appeal of the interface is better than most other mind mapping tools
Sometimes all the data on a sheet is completely lost. This happens on both bubbl.us and bubbl.us/beta. There is no revision history so it's impossible to retrieve.
I starting using bubbl.us because the interface was more attractive. However, after about a month of usage without any problems I noticed that one of my sheets had become completely blank. Soon afterwards I found a couple of sheets had this problem too. All the data I had was completley lost.