I'm looking at one of these used about 30 miles from my house. The unit is owned by an older guy that used it to mow 4 acres at his place. Hour meter reads 90 or so... Most of these I've seen have 23hp kaw's and I'm just wondering if this will be underpowered or worth the time to buy it. I'm replacing a 17hp Toro 44" gear w/b and dont have a lot of $ to buy new.