definitely go look at it/drive it. also see if he'd go with you to a mechanic you know and give it a once-over ($40-75).
before i bought the one i did, i drove one at a dealership in brighton ('00 CSVT, 53k miles), i pulled away to take it to my mechanic, and as soon as i put it in third gear, i turned around (bad synchro). they were trying to get $10k out of it.
i told the guy that it had that and he said that they knew about it, which is why that price was 'so low'
bull-f***ing-sh**