I don't yet have the Inc but I do want to try the sense UI and vanilla android to see which one I like better. Like Qazme I'd like to have the option and know that it exists. Give this info
http://forum.androidcentral.com/droid-incredible/18907-rom-update-works-battery-issues-low-signal-issues-addressed.html#post179318 I definitely want to be able to load/unload sense at my own discretion so I can see what works better.
I'm a tinkerer at heart and will probably like sense, then vanilla android, then sense, then vanilla android, then sense... ok, you get the picture.