I use it here and there as well. I combined it with meteor to give a presentation without having to screen share. https://github.com/phillc/meteor-impress

Example: http://phillc-cd.meteor.com/

Open in multiple tabs and click the following button in the top left and move around.

It's impressive. But I think it's too much and distracts from the content. Use animations wisely!

Use animations to explain concepts & context but don't make the animations your presentation!

Hey this is pretty cool. Not having to use additional screen share software is nice.