The picture above refer to a geometry form thingiverse that without supporting is piratically impossible to be printed
The picture show a supports set generated by a short overhang analysts with the default parameter,
results are excellent and thanks to the little contact points with the geometry the supports are really easy to remove form the part,
As a result the part finishing is much easier than with supports generated by the original slicer software
Like all the modelling software it is a little tricky, but very powerful. The interface probably is intuitive only to those already work with Autodesk product, but anyway it is worth to try and use
The software can be downloaded here http://meshmixer.com/download.html
a complete set of tutorial can be found here http://meshmixer.com/help/index.html
Thanks Micael for this great tip!