Issues can depend on the caliber. The 9mm Gen 4s had some recoil spring assembly issues in the beginning that have since been fixed. That said I have seen my share of erratic ejection in new 9mm Gen 3s and Gen 4s. I do really like the Gen 4 texture.
If you don't mind me saying I notice on your posts you've gone from handgun, to revolver, to shotgun, to Steyrs, to Glocks all in a really short time. I can't tell if you're building collection or trying to figure out what you want for a first gun. My best advice is to get to a range that rents and see what you like best. It's definitely worth the money.
Know the status of your weapon
Keep your muzzle oriented so that no one will be hurt if the firearm discharges
Keep your finger off the trigger until you have an adequate sight picture
Maintain situational awareness