If yours is not the SA3135, I would upgrade. Only issue I had with mine was the Crystal was to high, a quick trip to Tickleshoes and my movement was serviced and he put a new gasket in and it is the right hight- same as my Gen SD4k.
This is definitely a super rep! In fact the only difference I can see when I put them side by side (without a magnifying glass) are the reps hands are a hair different. My SA3135 SD4k even has the semi matte face- same as my Gen!
Out of the box (except crystal height- easily fix) this really made buying the Gen disappointing, as the Gen was big $$$. As far as reliability goes, I decided to leave the SA3135 (serviced) in it. I wanted to see if it would have any issues- so far this thing is perfect, keeps time perfectly! I also wear this watch everyday now (replaced the No date sub, I use to wear everyday) and no issues with the SA3135, and it is as silent as my Gen.
I have Yuki 's in a couple of my other Reps, but not sure it was worth it now. This serviced SA3135 is working great. I have 2 other reps that I am building, those will also stay SA3135. SoI will have 2 reps with Yuki's in them (gave the JF no date with the Yuki away) and 3 reps with the SA3135 in them. Will see if the SA stands the test if time!