Lance,
From your past offerings, I respect you as a considerable font of shotgun knowledge.Yet, the merits of the MP-153 aside, I don't think I painted pumps and auto-loaders with too broad of a brush when I opined they are less reliable than an O/U or SxS. The stick guns have their obvious advantages of lower initial cost and the ability to shoot more than twice. Also, some autos also offer recoil reduction. And, some folks prefer the handling characters of a stick gun. Still, IMHO, when it comes to getting off two shots, two barrels are more reliable than one. Isn't that why the vast majority of comp shooters, in sports with double presentations, select an O/U?
From personal experience: One of my buddies was the trap chairman at our gun club at the time I was the Skeet chair. In an attempt to foster more interaction between trap and Skeet shooters, I shot ATA trap for a few years and he shoot NSSA Skeet. I started out with a R-1100 Trap model and my more affluent friend got a Perazzi with Briley tubes. The Perazzi preformed flawlessly; but, by the end of the first year I'd replaced the R-1100 with an O/U.
One of my buddies, an All-American Skeeter, preferred his R-1100 over his Perazzi in 12-ga events because of its recoil reduction. His R-1100 was a D-grade from the Remington custom shop and fitted with up-graded wood. It was a distant relation to my out-of-the-box Trap model R-1100. His gun cycled with sturdy sounding clank, mine did so with a less reassuring clickety-clack.