A while ago I tried this add-on, and although it worked well, it had bugs with ActiveSync (which by itself is a buggy piece of crap but I have no choice as a Windows mobile user) so I couldn't keep it. I sent Quizo an e-mail about the errors I was getting but I really didn't think anything would be done, since it was freeware and all…
I tried QTTAbBar again recently and couldn't believe how well it worked with ActiveSync and how much more stable it was overall. This is incredible free software, even the plugins (which despite the juvenile ranting I've read on this thread were NOT difficult to figure out AT ALL; if it was THAT much of a challenge, that person should just get a Mac) work beautifully, entirely removing the need for the standard buttons toolbar.
Since none of the available Explorer replacements (Directory Opus, Total Commander) work perfectly with ActiveSync, I haven't been able to use anything except Windows Explorer - now I don't have to!
Thanks again Quizo for your fantastic work:)