I wore a 5100 R for a quite a while. They are certainly beautiful watches. My big complaint was the winding. I actually like winding a watch. There is something about that interactivity that I like. The 5100 takes quite a while to wind-up from nothing and I feel the mechanism was just too smooth for its own good. I would turn and turn and turn to get that watch fully wound and it did not feel like I was getting anywhere.