fman is currently hyped on Product Hunt and other websites, so I decided to give it a try. The dev seems like a really nice guy, the fman website and blog are really nice.
One thing I like immediately liked about fman: it introduced Sublime Text's Command Pallette and Go To function to dual file managers. Thumbs up for innovation!
After a month or so of usage, here are my 2 cents.
To sum it up, fman is (at least in its current version 0.6.4) far from being a TC replacement for Mac. It's just not ready and I can't believe people are paying money for it right now. I am a developer myself and this software is in beta stage at best. Many, many things are still missing. I'm keeping an eye on the development.