I've run through 1/2 a 500 round box I got a couple of for around $100 ea. It's Syntech 115 grain. It runs fine and is pretty accurate in both the PCC&SIG. I've reloaded a little it's fine but not as good as the Hornaday or Lapua ( they cost more than I paid for the loaded rounds)!
I carried ammo from a unique run of Blazer aluminum cased 124 grain Gold Dot produced several years back. I never had any issues with it in 2-3 different handguns. I see no reason to disrespect this type of ammo.
I don't see much risk. Surely you're not going to run the aluminum in a self-defense. But if you run it at a range, the worst that can happen is a case head separation. Not a big deal, especially since Ruger PC is always a takedown. Pop the barrel, and use one of your multi-tool knife attachments to get the case out. If this continues, well, then you tried.
The manual only prohibits aluminum case in .40 S&W guns. There's no prohibition against 9mm.
"Surely you're not going to run the aluminum in a self-defense. "
HUH?? Why not? If it works, it works. I carried aluminum cased 9mm for years and shot a lot of it w/o any issues at all.