I am big IWC 3714 fan. I have two of these I got from two different dealers. They are bought two months ago. So I believe they are the latest movement.
The picture below, shows 2 sets of gears which is related to the friction issue that is widely known. I've increase the saturation of the image to show the wear of the gears. First two gears on top, came out from a portu that ran for roughly two weeks on and off. I pull the stem out to hack it when I am not wearing it.
The second set of gears below, it probably ran for 3 days during the EMS transit. I hack it immediately after receiving it. You can see a tiny bit of wear on the left bottom gear, where as top gears suffer serious wear.
Please note, the movement could have spend sometime running during assembly at the watchmaker's "office", so it could be longer than stated above.
I gave up my worries, I got a bare movement from Concepta, the gen is a extremely beautiful movement. The seconds run smooth, less jittery and time adjust is butter smooth. Of course, it comes with a price but the gen movement upgrade is definitely worth it compared to buying a whole gen.
But what about the other IWC? When Avitt decided to offer DLC coating, I had to go for it. My plates are still on the way to the master, I will report back once I put it to work for a few months. If this works, I hope Avitt could invest time in perfecting DLC coated gears. This would bring replicas to a whole new level. This is most interesting development after custom AR coating.
You notice I quoted the word "office" previously? No matter what you do, please send your watch for a service when you get it. The amount of dust?/crap left behind when cleaning all the parts took me by surprise. I specialize in micro electronics but I can tell how bad it is. In another words, a new dirty movement in my new watch.