I tried PD5 and liked it quite a bit, and only stopped using it because I was looking for something a little more polished looking. I wound up trying Directory Opus from GPS Software and liked it alot as well. The PD6 update looks worthwhile, but I've gotten used to certain "power user" niceties I've found in Dopus like...
- when you hit to rename a file it only highlights the filename prefix, not the extension.
- when you copy a file to a folder where that filename already exists, Dopus let's you replace or rename the file to your preference during the copy operation.
- there is a 'size' button that calculates the size of folders (contents) and reports it in the main file viewing window.
Nothing major, but quick little productivity boosters that I find myself enjoying the ease of use of dozens of times every day. If V-Com were only to add in these kinds of functions as 'options' or whatever, I'd buy in a heart beat insetad of Dopus... mainly because of the easier to use custom toolbar and now the new skinning feature

. But my trial for Dopus will run out shortly and I'll need to make a decision soon because explorer truly sucks once you've come to depend on 'alternatives'.
Once annoying problem I've had with every explorer replacement I've tried is that if I perform operations on files in a folder, and subsequently try to delete that parent folder I cannot. With PowerDesk I could just close the current window and open it up again, but with Dopus, I have to kill the Dopus.exe process in task manager and re-launch it. Very annoying and I wonder if running on top of the WinXP explorer shell is causing it... With Dopus I tried the "Replace Explorer as default shell" option but it did not help.