Looking at the new 3.6 firefox I was quite taken by the new Personas, until I realized that they could only be used with the default theme which, frankly, is so boring it would send an insomniac to sleep. So, good idea but big fail until they can be used with any theme.
Using 3.6rc1 and the pull-down menus look terrible. Dark gray with greenish gray selections. Somewhat hard to see sometimes.
The metallic persona looks good on my laptop and I really like the custom toolbar buttons addon.
Yes, looks great. Just installed it to have something other. Every day a new appearance with no stress - why not?