Firefox's new "Inspect Element" feature.

I just started noticing this feature, so it must have come with a recent update. It seems to be a native implementation of what Firebug does as a plugin. However, since Firebug is free, and I like it a bit better, I kept the add on, and don't use the native one. Has anyone tried it out? What do you think?

I have been too busy to sit down and really play with it, I have had some co-workers say it can act starnge with refreshing the page

But they have info on it here: https://developer.mozilla.org/En/DOM_Inspector

Eric