Here is a Gen 3 thread for an April 2013 gun:
Late model Gen 3s and Gen 4s share the same problems.
I don't think I see as many problems with the .40s. Why not search the forum or post another thread asking specifically about the .40s. Sure, the 9mm is easier to shoot and perhaps ammo is a little less costly but a number of users are really frustrated with the 9mm guns.