I used it a lot at college when I was forced into using DAISY books, being able to wildcard select just the mp3's in a folder without having to go through the whole view, sort by, type, then find them and faff around was useful.
I'm not sure how well it will integrate as a replacement shell on modern windows, and I make heavy use of my win+e key and the run dialog both, so if I wanted to get hold of it on a modern system I'd need to look into that.
I also ran
$1 back in my Win7 days when I used explorerplusplus, which is also still around, according to a quick google.