I shoot skeet with a guy that has close to 750k rounds through his Beretta 680...been in the shop twice, once for lever replacement and second time for an update and cleaning. I have close to 400k through my 687, in shop once...had 32" barrels fitted and while there a cleaning and repair/replace anything that needed it...they replaced all springs. Also shoot with (7) other guys that have Krieghoff's that are always "in the shop"...I have no idea if the guns are that bad or the guys just like to have the guns cleaned, 100% factory or whatever. Again, I cannot say the K-gun is not reliable, but based off the guys I shoot with that have them, it seems that way, the B-guns on the other hand, seem to run fine.
Kreighoff has an annual upkeep program you send the gun on to, or drop it off if close enough. Many Kreighoff owners have 2, a newer, fancier one, and an older K80, 32, or 3200 to shoot when the regular gun is in for it's annual. They are also a backup for important shoots, though this brings up a point as to why Kreighoff, Perazzi, and Kolars guns cost a little more. All three have detachable trigger groups, that can be swapped out right on the line. Perazzis in particular, are known for the leaf style hammer springs breaking. They can actually be changed on the line in a minute or two. Some guys will carry a complete trigger group in their vest, swapping them out is even faster.
As was already mentioned, Kreighoff trigger groups are almost over adjustable, like a Panhead Harley. Trigger groups for these guns are made to work several ways; pull, release, pull-pull, release-pull, pull-release, and, even Release-Release.
Some guns are known for triggers that are as smooth as butter, and these are generally the medium higher (5000-20000) priced guns. As I mentioned earlier, my Ljutic has a smooth, crisp trigger at 3#, and my Ithaca 4E the same, just a little heavier at 3.5#. This feature alone make a lot of difference, even with shooters that don't realize it. Several people have shot a round with my Ljutic and shot better scores simply from the trigger, and possibly the rollover comb and Gra-Coil recoil reducer.
The saying goes you can't buy birds, and it is true, but such features makes increasing one's average easier to achieve by eliminating variables.