I do and I'll continue to do so.
The myth of "steel case is bad" has been proven wrong time and time again.:banghead:
It is more than simple myth.
The cheap Russian steel case ammo is inferior. The jackets are typically bi-metal or copper washed steel, which wears out rifling more quickly than copper. It can also cause sparks/more sparks when striking objects or certain backstops, which is some ranges, including outdoor ranges in fire prone areas, don't allow it.
It is also often just that...cheap. Lower quality. Less consistent. Dirtier. Etc.
Now, don't get me wrong, I've put a bunch of steel case through my Glocks (Tulammo, Brown Bear, Wolf, etc) and will continue to do so.
I also have a few hundred rounds of steel case .223 (TulAmmo) that I am testing in one of my AR's (so far so good with something like 200 rounds). But it is inferior to the good stuff.
Here is some good reading, if you are so inclined. I highly recommend reading the whole thing. And, when you get to their 'conclusion', do keep in mind that they complete ignore the value of the spent brass cases. An economically minded person will probably recover much of their brass and either reload it or sell it.
http://www.luckygunner.com/labs/brass-vs-steel-cased-ammo/