I have a Koyker 150 mounted on my 1999 Cub Cadet 7260. 60" bucket. Tractor now has 500 hours and the loader hasn't been off of it. No problems yet. I think your assessment of them being middle of the road is pretty accurate.
JD 8320 MFWD, JD 6415 MFWD, FEL, and cab, John Deere MFWD 4600, John Deere 4020, John Deere 4430, John Deere 455 mower, Deutz, and Gehl 4610 perkins skidsteer
I've got one on my 4020 and it's worked just fine. They were very heavily built.