Doing my first backup from Ubuntu 11.10 with Deja Dup--my only complaint right out of the box is that the backup schedule isn't very granular. The lowest interval is "daily" and you can't set when it happens daily.
I had BackInTime set to backup hourly, which since it's only backing up the deltas (which Deja Dup also does) meant most of the time it wasn't actually doing much, but that was a nice thing to have in place in the unlikely event my hard drive completely tanks and I'd done a ton of work in the course of an hour that I hadn't yet committed anywhere.
But, I'll give it a shot. Every hour's probably overly paranoid anyway. ;-) I do like the fact that it has more knowledge of backup location types, particularly since I backup one of my machines to my Amahi and Amahi exposes everything via samba ("windows share"). With BackInTime I had to add the Amahi backup location to fstab which wasn't a big deal but out of the box BackInTime wouldn't be able to back up to things like Ubuntu One, Amazon S3, etc. unless you mounted those resources first.
I'm starting to think maybe they removed Amazon S3 as a direct option in the Ubuntu flavor of Deja Dup based on things I'm reading about the tool itself outside of Ubuntu, so I guess to back up to S3 you'd first mount your S3 drive via JungleDisk and then point Deja Dup to that.