Don't get me wrong, I love all four of my Mossbergs, but for a semi-auto, it's gotta be a Benelli M1S90. When I was looking to buy mine, I considered the "Jungle Gun", especially since I've had such great luck with the 500, 590, and 835 Mossy pump guns. Talking to a couple guys who had tried them, and reading what I could find on various forums, I decided the "M1-Superduper-90" was the only way to go.
As you're "getting to know" your new mossy, let us know how it goes. Maybe they've improved them and/or addressed the reliabilty issues, or maybe the early batches just weren't as good. I hope that's the case and yours proves to provide the same level of performance I've grown to expect from Mossberg. Either way, keep us informed. Good luck.
-John