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I like the JM Pro. The last large 3 gun match I went to myself and another guy had JM Pros and finished w/out any issues while some of the guns mentioned here were also used by others and had problems.
REMEMBER... The guns musts be cleaned...most of the people that have problems have never cleaned the guns. The JM Pro must be cleaned out of the box and then broken in and cleaned again.
I have never had any issues with mine.
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Swapping in the OR3GUN parts will have a get them running like a top.
At one point myself and two of my teammates were running them, and we had a spare.
4 JM's between us. Mine was the only one or of the box that had issues. They all had the OR3Gun parts installed and an issue was never had again.
From the 930s I switched to an M2 (which I've since sold) and another guy switched to an A5. Both guns weren't reliable out of the box. I swapped parts until I got it somewhat reliable and sold it for a SLP, the A5 shooter opted to stick with heavy fast loads. The guy who is still shooting the 930 still has a gun that's chugging along.
I prefer my SLP to the 930 because of refinement, but the 930 is far from a bad gun.