Is it considered a good purchase?
Borderline, 250 a foot is okay.

Or will we have lot of trouble during resale?
Yes and no, cul de sac is a plus but being the 1st trac next to the freeway a real minus. Also you’re in by Camino Del Sur so you are stuck using the 56 (get nasty during rush hour) in either direction

Worries me that it’s been listed for 9 months. Price is wrong or there’s something else

Being next to a freeway long-term I think would bring health issues (respiration, exhaust).