GREENALIEN I just tried the trial version while maczot had a special on. I found the app a little slow, and it had a negative impact on system performance. For example expose would go jittery during animated scale effect. I tried running ForkLift (which also has a Finder-like dual-pain setup) and no performance issues with that. I therefore decided not to purchase Path Finder.
It would be nice if Path Finder and ForkLift met somewhere in the middle though and started to implement each other's features. Either Path Finder implement FTP/SSH/sync transfers or Fork Lift implement more local file browser functionality.
(Version 5.0.6)