On the surface, this is a great product, with numerous features. However, it suffers badly from some poor fundamentals:

* As others have noted, it's *sloooow*. Don't expect more than 100K a second (yes, 100K) for most backups.

* Networks seem to baffle ChronoSync. It has trouble connecting to shares to do a backup, both CIFS/SMB and AFP. I've loaded a CS backup document from a share and have CS tell me that the share (that I just used to load the document!) is invalid.

* The exclusion/inclusion rules are odd. Want to backup all your home folder but exclude a particular folder? It *can* be done, but good luck finding out how from the UI and/or the docs.

* It's interactive model is broken. Like so many badly designed apps, when something unexpected happens, it stops and asks you what to do. OK, great, but what if you're half-way thru a 10 hour backup and it does that? You get up in the morning, expecting your backup to be done, only to find that its been waiting all night for you to click "Continue". Absurd.

If you are looking for a plain backup app, checkout SuperDuper. If you are looking for a good file sync app, sadly there are no major competitors to CS at present.