Pros: I have recently backed up my netbook's hard disk (with Clonezilla) repartitioned it (with Parted Magic), reinstalled Windows (from the ISO image of my install disk), and installed Lubuntu on a newly created partition. I could put all these tools and install disks on a single multiboot usb flash drive. No other tool can do this for you.
Cons: None. Maybe it does not support every possible OS other there, but (IMHO) it support ALL that "count". The selection is VERY broad.
Other Thoughts: To have a single USB key with all the necessary undelete, backup, restoration, repartitioning, antivirus, and OS install tools is priceless, and it is possible with YUMI.