Personally, if it's taken care of, that is a decent price for a 72" Dixie. Hour wise they can top 1000+ easily.
Just like any zero turn, the ride will be a little rough, so hopefully the previous owner installed a suspension seat. If it's still rough, go get a set of flex/suspension forks for the front casters.
I use a 60" classic on 2 acres and can have it mowed in 1.5 hours with the suspension kit on it.