I bought a Cub Cadet Ultima ZT2 with Kawasaki FR730V engine and Hydro Gear ZT2800 transmissions. It listed for $4,299 but I got it for what turned out to be about $3,900 new from HD in April 2021. (Their ads misstated the machine's transmissions, so they offered a 10% discount or return, I chose the discount).
It is pretty robust except for the standard mower blades that are just too flimsy and not hardened enough. Mostly fixed that with the CC Mulching blades that are holding up much better even though I only discharge not mulch.
Otherwise, the engine, being a Kawasaki, is testimony enough for a quality. The transmissions are high homeowner low commercial grade and are fully serviceable with filters. The rest of the machine is OK. I say that because I beat it hard with 4 acres of hilly land mowed weekly at least. End of 2nd season about 145 hours on it, and it is doing just fine.
CAUTION: Unfortunately, Cub Cadet has changed their Ultima ZT line since I bought mine, and in my opinion, downgraded these ZTs to slightly less desireable Kohler engines and I believe, a lower capacity, non filtered TufTorq transmission model. The prices are up too. Currently, this same Ultima ZT2 with 60" deck, the newer, I think less robust transmissions, and the Kohler engine is now going for $5,299. at the HD store I bought my CC ZT at in April 2021. Since April 2021, that is a 23% increase in price with lesser engine and transmissions (my opinion).
Do your research. In my opinion, the real value in anny yard machine is the engine, transmissions, followed by the build quality. I do my own welding, so I concentrate on the engine and transmission first.
Shop your budget but be fully aware of what you are getting in engines and transmissions.
Good luck.