I did buy Chronosync a while back and yes - it was very good. To be fair though Windows comes with Windows Backup built in which is very much the same if you want to use that with an external drive for timed backups. That Western Digital software though is easier - it basically sets itself up and does backups all the time, not just on a schedule.

I didn't move from Mac to Windows because of the backups though. It was only when I decided to change that I realised I'd been kidding myself that Apple did this better than the rest.