I've done it. I really liked it. You visit the units enough to know people, but not so much that you're involved in the politics. Plus, you get more freedom in your hours--always a good thing if you're in school or have other obligations.
Plus--most of the time everyone's glad to see you...your showing up means they have fewer patients. Some of my fellower floaters felt like they got stuck with patients the other nurses didn't want, but I think usually the charge nurses give you a wee bit lighter of a load since you're not familiar with the unit.
The downside is that you have to ask more questions r/t knowing where things are and even in the same hospital, units can be run quite differently; but my experience is that the other nurses are pretty nice.
You may get called off more, but it's easy enough to add extra hours if you need the money. Where I worked floaters were in demand enough that people who wanted to work OT, were able to do so.
I'd recommend it