My Sig 226's....came with factory Sig mags...and only the flat metal base plates on the mags...no bumpers. ( I don't shoot the Sig 226's that much ...I'm a 1911 guy ) ...but I picked up some rubber mag bumpers for the Sig 226's and those have held up well also.
Several of my buddies shoot 1911's in our weekly tactical drills and friendly competitions ( Springfield, Kimber, Les Baer and Ed Brown ) ....and they have all converted to Wilson mags after their factory supplied mags were failing when dropped on concrete after a few months ( and most of those supplied mags as I recall had welded base plates on them...)...some of the guys are using Wilson mags with their smaller standard plastic bumpers, some use the wilson mags with the aluminum bumpers, and I prefer the enlarged ETM base plates....and they have all held up for at least 2 years.
I like the durability of the Wilson mags....and I prefer the ETM base pads - bumpers...because I have large hands and they just seem to fit in my hands and work better for me on Speed Reloads.
as a note ( Les Baer used to ship his guns with MetalForm mags...and those were the ones with welded base plates that fractured..sending springs, etc all over the place when they failed )....I don't have any idea who was manufacturing or supplying mags for Springfield, Kimber or Ed Brown ...
followup note...discussing this with my buddy at range yesterday, he reminded me that one of the reasons ( besides protecting the mag from damage as we drop them on concrete floors ) is we like good bumpers on our mags on a "speed reload" drill ...where we drop a spent mag, and we slap that new mag into the gun very firmly ....and the "bumper" helps us have enough "meat" on the mag to get that done consistently. He prefers the older style metal bumpers on his wilson mags ( his hands are smaller than mine) ...and I like the ETM bigger bumpers because it give me a larger surface that I like...the size of the ETM bumper base plate helps me get a firm grip on the mag coming out of the mag pouch - the smaller ones, slip areound too much in my hands..