Mine is actually a ZForce 44 but this model was not an option in the model choices on this website. I bought this new in 2004 for $4400 including bagger and have 200 hours on it and mow an acre.
I have spent little more than the cost of gas, oil, and filters to maintain this mower - not even a broken belt. I did find a sloppy bearing fit in the double pulley and took up the slack with JB Weld and after 3 years it is still okay although gets hot with use.
So everything seems okay mechanically but this mower is so miserably loud it is almost unbearable, even with earplugs and a headset combined. I will definitely shop for a quieter mower next time and would appreciate any advice on this including the best hearing protection.