Not sure why the Hi-Power never became as popular as the 1911. There aren't dozens of clones floating around and a huge competitive shooter following. It's one of the best 9mms made... ever.
...yes, I understand that they were THE gun of choice of militaries, police, govenments, etc. for decades, but I can't just walk into my LGS and ask for a Springfield, Colt, Sig, Kimber, Wilson... etc. Hi-Power and get pointed to the hallowed box full of steel-framed goodness.
I had an old FNH Hi-Power once. I sold it because I was young and dumb. I haven't owned a 9mm as good since.