Hi Donkbet, I've owned my 870 Express for over 28 years, and have never had any problems. I've got an 8 + 1 round extension (2 3/4 in.) on her (my baby). There are no comparisons between the Rem. 870 to any Mossberg. Rem.870's are built to last and take a beating, the 870's haven't really change all that much in over 40 years. Why screw with perfection! I have used my 870 to hunting black bear and deer for years and home protection and as back up when hunting. So if I were you, I'd buy an 870. The 870 is probably one of the easiest shotguns to maintain. It's been a standard firearm in use by the military and police for decades. There are a crap load of accessories for the 870 out there, buy one and you will never regret it.
Thanks M.
P.S. I didn't see your post about ordering the Mossberg, oh well, you should still look into getting yourself a 870!