Going to look at a used Scag 3-wheeler mower. It is about 5 years old and 61". I think it is a STHM model. Has about 900 hours on it. The guy is asking $1000.00 OBO for it. I don't know much about this mower. Any feedback. Good mower, bad mower, how does it cut, worth it. The guy says it needs a tuneup and has a slow leak in the back tire. Also, what is the deal with the 3 wheel configuration. Any benefits to it? Thanks for any info.