While it still should be considered beta, this program performs its task well.
The scope of this app is the first thing you should consider. The app is intended to be clean, lightweight, and portable. If you were expecting Strictly structured documents with multiple third party integration, extended printer support, and full media utilization then you are looking in the wrong direction. Try some other commercial bloatsoft application. What you will find here is a quick loading, Non strict, modeling environment that tries to bring modeling back to its basics.
The work space is an unlimited space that can be scaled and zoomed independent of browser zoom. The images that can be saved are fitted to the scale of the model that is being worked on but can only be downloaded as a whole model image. If you are working on a very large diagram that image will be very large in pixel size. Thankfully it's a .PNG format.
The non strict nature means that you are never tied in by special rules or format types. All elements that can be created, for whatever visual models that are available, can be added in. Where elements may be useful for class or use case diagrams means nothing for any restrictions on functionality. All objects are treated just as they are, with nothing more then shape, text, and anchor points as a variation.
Being a Google Docs app, the work space is collaborative. The user can invite team members to the app and work on larger scale models or mind maps. Having modular tools and being so lightweight allows it to be used and edited quickly with no restraint on what type of model needs to be created.
All in all, this application is perfect for students and agile/extreme practices where more output is required at a quicker pace. Where secondary software or presentations are required then a more specific program may be needed.