+1 @Rolexia Not worth the premium.
As we speak, there's still NO parts readily available for SA3135 regardless version, no one knows who makes it. Everybody knows crown stem is fatal. Parts are of poor quality + NO gen parts will fit except superficial parts like DW and hands. The pro is, with this movement you have a true to gen crown height + gen mounting style without movement spacer. vs the ETA.
Rep 2836 or 2824s are much more robust built, desk of parts everywhere, gen or rep they both fit! Anybody can service and work on them. They are workhouses, period. But you have to live with the low crown height on 2836 in Rollie applications while the 2824 sits higher and is visually correct to gen.