I actually tried this on iOS a few months ago. The experience was far worse -- felt slower, less responsive, harder to navigate -- so I re-installed the app.
On the flip-side, (again, anecdotal sample-size-1) I've noticed a definite improvement in battery life after uninstalling the app, and I definitely don't needs any of Facebook's notifications to propagate through via the app.
My Facebook experience is not very involved. I just scroll through the news feed, look at some photos/comments. Works fine for me, but if you are a heavier user, the app will of course be more fluid.
