Fabulous product. It is ideal in my view: it makes using your Mac simpler, but you otherwise don't notice it. That is, it's simply there, doing what you need, without having to invoke it (once you set it up).

One of the chief ways I use it: I have a series of important documents I keep on a USB flash drive (so I can work on them on my G5 and my PowerBook). Since I have a bunch of flash drives around, I back up the docs to two of them. With DSW, when I plug the backup flash drives in, Synk (the wonderful freeware version) is automatically launched, allowing me to back up with a click. DSW then unmounts the backup drive when I quit Synk. Flawless.

I, too, found I had a problem updating to 1.1.1 (from 1.0.2), so that drops the rating for Ease of Use a bit, but otherwise it's 5 stars in all categories.