Just installed Pathfinder, to check it out;
1) Its slow. Rendering of the window, resizing and such isnt very quick, there is lag. Moving around through folders with many files, particularly images, isnt very quick.
2) Cut/paste works.
3) Pasting a folder into a directory where a folder of the same name exists does NOT merge them, it simply replaces it. See complaint #2 on my previous reply. This sucks.
4) Previewing images is acceptable, but still not as quick and simple as on windows. However, it does do a fairly good job of displaying images and scrolling through them as previews and such, so jumping from folder to folder via pathfinder to view/move/organize/delete photos is actually pretty good. It even allows for dual windows, as in, you can browse through two sets of folders and the preview shows up at the bottom! Take a look at some screen shots I took.
http://www.ungraphic.com/stuff/pathfinder1.jpg
http://www.ungraphic.com/stuff/pathfinder2.jpg
http://www.ungraphic.com/stuff/pathfinder3.jpg
In each view (when using dual) the display of folders can be modified as well, weather in column, list or icon. GREAT function. However, a bit slow, you can feel the lag, and my computer is by no means slow;
My system specs:
2x2.66ghz Mac Pro 1,1, 2gb RAM, 2x3870 ATI, 2x250gb RAID0 startup drive (7,200rpm), 200gb WD, 160gb Seagate.
I still think Pathfinder needs some heavy tweaking, especially with the lag issue.