I have owned one before, never had problems; it was a decent little shooter for the price. Personally, I prefer Sigs over Glocks. Learned to shoot on a glock but after shooting a sig, there was no going back. Glock has a funny grip angle IMO.
I love my 19. It is the mid-size. There is actually an even smaller one. I have had mine for over 10 years and have put 1000's of rounds through it. I have only had a couple of jams and that was on reload I bought at Caswells. It seems most are going with the 23 for the .40 S&W, but I'll take the accuracy I get with my 19 over more lead any day.