I have all the M-series Benelli semi-autos. I take out the M1 Super 90 a lot more often than the others. Yes, the M4 is a beast and is <probably> more reliable with various loads, but man the M1 is so light compared to the others! I could carry it all day. Mine came from a police department so it may have been tuned. It certainly has seen a lot of rounds. The action is just buttery smooth. Not sure if a brand new one would be quite so nice, but for me the M1 is the shotgun I would keep above all others. Mine works great even with crappy low-brass Walmart birdshot, too.