Interesting question as I have a 23 year old Grand L3010 hydro at I bought new that I use a 7 foot wide Parma Arena Groomer on 2 outdoors and an indoor arena and can run in high all the time. I also cut the pastures in H usually unless the bouncing is too much. Maybe the older hydros were...
I have a ZD1211 that I bought in May 2020 that's been great. I still have a 2001 ZD28 that I still use also. It has never been back to the dealer. I've just done the recommended maintenance. Same for my 20 yer old L3010 tractor. Never been back for a repair.
About 14 years ago I had the local Farm CO-OP bring a 300 gallon tank our for off-road diesel. Full size nozzle and electric pump. It was NO COST to me. I just call them when I need a refill and never had to have any repairs except a new nozzle and they didn't charge for that either. Best...