I still depend on Hazel and it's one of my top five Mac applications. Version 4 is out today (after some website hiccups) and adds live rule preview and rule syncing through Dropbox. Hazel is one of the things that I most miss when I'm on iOS. Heck, Macdrifter probably wouldn't exist if it weren't for all the time Hazel saves me posting screenshots and publishing articles. It's also still the heavy lifter in my photo management workflow.
Note: I haven't really used version 4 yet. I don't beta test my infrastructure. But every upgrade of Hazel has been rock solid for me and I've never regretted using a first version.