The one problem that I saw with StyleXP, was that some of the pallete controls (most notably Photoshop 7) were not aligned correctly in the default skins that came with the program.
I do like the windows theme engine, and would use StyleXP if the program installer would have backed up the original files and restored them upon uninstalling the program. This would have made the program very nice. The maintenance required to restore the Windows file(s) if one does not want to use the program anymore and unistalls it, is not - IMHO - a good selling point.
Of course, I also like 'Luna'.
Oops, should have been "uninstalls".
No, certainly not in Microsoft's backyard, anyway..
Nor is it a positively/formally sanctioned 'hack'/third-party modification of an MS dll.
It DOES appear to contravene the MS EULA but since MS apparently is 'ignoring' the hack and/or it's legitimacy I guess we all can, too...
The fact that something is readily available does not make it legal or legitimate...just readily available.