I have been working with Joomla for a little over a year and I use the commercial version of Joom SEF 3.3.0. If you want total control over your urls this is a must have component. There is a free version for you to try (no support)and it is not encoded.:)

The product works great. However, before you run off and install it make sure your Joomla native SEF is working as it should. Also, learn how the component works to avoid the fustration that self inflicted mistakes cause. If you have an issue with it believe me its probably you.

I would give this component 9.5 out of 10. Actually make it 10 out of 10.

I have tried several tagging extensions and I liked this best. Nice looking cloud module. Lots of options in the module and the component. Definitely worth taking a look at.