Been shooting a 9mm L since March, 100% reloads through it so far. General comments:
-Gun sits very low in the hand. Low bore axis is a good thing.
-Low profile slide (height). This allows the pistol to sit lower in the hand.
-Low mass slide. I need to throw them on a scale, but the slide of the G17-sized L seems to weigh about the same as a G19 slide.
-Steep grip angle. It is steeper than the Glock; your wrist angles downward more with the Steyr. This is noticeable if you go back and forth.
-Trigger pull is relatively light.
-Trigger pull has a few stages of creep when pulling it slowly.
-Trigger reset is not very tactile nor audible. The reset point becomes easier to detect with more familiarity of the gun, but there's no loud click and snap feeling.
-Magazine well is a small workspace. No bevels or chute to work with here; it's a trade-off for the very narrow grip.
-Trapezoid sights have a tendency to result in high POI, as you automatically want the front sight triangle to rise out of the rear trapezoid. Training issue.
-Barrel seems to unlock late in the slide cycle, which in theory means the bullet is well clear of the muzzle before the barrel tilts and the sight picture is disrupted.
-Loaded chamber indicator (looks like a second firing pin on the breech) nicks up the brass rim pretty good and I have to toss the brass after a couple firings.
The combination of the low bore axis, extreme grip angle, and relatively low mass slide result in a pistol that has very little muzzle flip and begs to be shot fast. If you try to shoot it with a slow, deliberate pull as you would a target pistol, the trigger doesn't seem so refined.
There's too many reasons for me to never give up the G19, but on the range I'd rather be shooting the Steyr, and I have.
I believe the Steyr S/C/M/L family is a real-deal evolution of handguns, employing solid principles that make for a flat shooter with quick follow-up. I have never felt this way about any other polymer pistol, and I've tried most of em.