I love it too and was disappointed to read recently on HN it's not easy to do on Linux, as I intend to switch to Ubuntu on a desktop soon. If anyone knows the best way to set it up I'd like to hear it.

However, it's become a pain lately anyway in that it doesn't work for images [maybe over a certain size?] stored in iCloud (unless it's already downloaded) which includes the desktop folder and therefore screenshots (because letting you store screnshots anywhere else by default would be logical and we can't have that). Nor does it show anything to indicate this, it just appears to randomly work or not work. I wish they'd send a lower res version for previews, or something, as more and more stuff moves to the cloud.