Doing my internet research prior to buying, I was not able to find a comparable gun that did not have issues. Kahr (really like those), Kel-Tec, Taurus, etc. The Glock would probably be a more sure bet but it is not really comparable (thick as they come). I would say stick to 9mm in these weapons. I love my .40s but when looking at PPStalk.com you see that the vast majority of the issues with these guns come along with the 40. The PPS is also on its 3rd minor revision. The PPS's with serial #s starting with AB were the first run and are the most problematic. From what I read they made some subtle changes in the second and third runs to address some of the reported problems (particularly the slide problems) but I can't remember specifically what they were. When I bought mine I made sure it was an AD...
Buying a concealable gun will usually be a compromise. You have to know your options ahead of time and make an educated purchase. That said I am well over 1000 rds thru my PPS9 and the thing flat out rocks. Can't believe how well I'm able to shoot that thing, it hangs right in there (almost) with my USP40 at the range. The build quality is top notch. It actually has a metal frame laid into the polymer frame. Over built. Thats all good but we all know you can build it to be the best gun in the world, but it still has to be reliable.