The technology used to generate URLs is superb, and make it the king of performance, but forget any other additional functionality. Its old.
Ease of use
The use is immediate, in 30 seconds you have configured all the component.
Support is shameful, there are serious problems with some essential functionality such as generating SEF URLs for RSS feeds. I gave up.
The documentation is old and ambiguous, you will not find specific information, especially if you want to develop addons for your extensions
Value for money
The price is far too high for the product that is provided to you. Full of problems and with almost absent support. Not a safe choice.