The ones you get at lowes, sears, home despot (intention mispelling) and the like are all cheaper units mostly made by American Yard Products, or something along those lines.
I've got a crafstman 54" that I got new from sear in '09. While it still runs, not much left of aside from deck, frame, sheet metal (if it can be called that), and engine are original...
It has the kohler 26 horse twin, and even that damned thing has had a bunch of parts put on. On the third new starter, new coils and plug, on the second PTO clutch, 3 new tires and now all 4 have tubes..7 sets of blades, 4 set of each belt, two new batteries, and before spring I have to replace the wiring harness, due to a rat or some kind of rodent. About to say fuck it and buy a big Cub or even a real Johnny fuckin' Deere. For what I've put into the craps, man, I could've bought a decent 2, 3 year old "real" JD and still have some dollars left over for a burger and bucket of gas...
Pay a little more up front, or a lot more on down the road with mowers. My dad had a Massey Ferguson when I was a kid. You know...one of those old heavy all cast iron motherfuckers...
The first engine shit the bed sometime around when I was 5, I remember him changing it. Put a early kohler on it. That one last about 5 years, and threw a rod. He came in off the road (he was a trucker), and had bought a tecumseh somewhere. We put that one on it ran till 2014 as a backup to his oft-troubled craps, man POS. Last time he used it, it too threw a rod so he dragged it up to the barn and threw it in the scrap pile. I ought to go get it, find a Honda horizontal shaft and resurrect it. Smallish deck...42 or some shit, but it was built to last. I remember the shaft that drove the blades would shear a time or two every summer. Always a bitch taking the deck off, loading the bastard and taking to town to get welded back up.
They don't make 'em like they used to..