I have owned one. I had to sell it when I was short of funds.
After some initial teething problems, I really learned to like this pistol. Mine was a Steyr M-40.
When I bought the pistol and took it out to shoot for the first time, I had a lot of malfunctions where the slide would not return fully to battery after firing. The slide would seem to "hang up" about 1mm prior to being fully closed on the new round. After 500 rounds, the problem was still happening about once every third of fourth magazine. I also had one of the earlier ones that had the trigger that would cause a variable pull weight from time to time--a design defect. GSI, the importer in Georgia, put out a non-safety related recall on them to have the trigger group replaced. I sent it off to do that, plus have the issue of the slide not going into battery looked at. When I got the gun back, it appeared that the gunsmith had polished the breech face. From that point foward the pistol was flawless.
I do like this pistol MUCH more than Glocks, as I am one of those who feels a Glock is akin to holding a 2x4, and am convinced that Gaston Glock must have used a 2x4 as a reference point when designing the pistols horrible ergonomics. The Glock would be perfect IMHO if the ergonomics were not so bad. The Steyr seemed the answer, and it became my favorite pistol.
It should be noted that GSI is no longer providing warranty service on this pistol as Steyr-Mannlicher has failed to renew their contracts with any US business for not only importation, but warranty service. Multiple letters from GSI have gone unanswered. So, if you want to have your pistol serviced, then GSI will do it, but for a fee.