Ditto for me.
Although I delayed getting a license for months because it lacks a feature I wanted (see Post #881 is this thread), I’m glad to finally be using ForkLift. The productivity increase resulting from using dual panes is alone enough for me to justify the cost. However, in addition I found the synchronization capabilities of ForkLift meet my needs better than anything else I considered.
ForkLift is completely useless for me. I just tried their latest version and they still don't support the most basic of functionality offered by Finder, Path Finder, QSpace, etc. In List View they don't record the expansion state of the folder tree. So when you return to a folder you had expanded, it shows totally collapsed. I always use List View and that basic functionality is a requirement.