I'm yet to have a failure with this gun of any kind that isn't ammo related. It runs everything I put through it except for the occasional really hard Russian primer.
Of course people will tell you to get a Glock whatever instead but if you like the Slim and it meets your budget I say give it a whirl. I'm glad I gave it a chance. I got it, ammo, and two holsters for the price of a Glock.

It does conceal remarkably well.