I had a bad experience with steel cased rifle ammo about 10 years ago and told myself I was never going to shoot steel case ever again.
Fast forward to 2013. Ammo was difficult to find for obvious reasons and I was a bit low of reloading materials for 9mm. So in a bit of desperation I bought a case of steel cased 9mm from Wolf (WPA Polyformance). Long story short, it ran flawlessly through all of my 9s, which included a S&W Shield, S&W M&P9 1.0, Glock 19, Ruger LC9S Pro.
To this point, I've run more than 10,000 rds of steel cased ammo through my various 9s, and still have yet to have a serious or consistent malfunction. The Shield has never malfunctioned firing steel, and neither has either of my M&P9s or the Glock. The LC9 has had 1, out of more than 1,000 rds fired, and hasn't had one in over 500 rds. The Ruger 1911 9mm has had three, but I'm pretty sure that at least two of those (if not all three) were related to the magazine (10-rd mag).
As for accuracy, at "defensive" distances, out to 15 yards let's say, I'm not seeing a significant difference in my guns. Just a year ago I split a playing card at 7 yards shooting steel cased ammo on my 2nd shot. in other words, I'm seeing steel cased bullets hit where I aim them, pretty much exactly like brass cased ones. At least through 10,000+ rds so far.
Anyway, after some experimentation, I decided to buy only steel cased ammo for my 9s, which made a little room in my budget to buy more projectiles for my reloading stash. So now I have plenty of lead for reloading 9 until this panic subsides, i still have plenty of steel-cased rounds to go thru before I have to start reloading, and I haven't had to collect any 9mm brass in a couple years. Win win win.