Used MTB's have poor resale value, the 950 was a decent level bike, rear rim looks like the rider preferred using the rear brake the most so check the rim for brake wear (I've seen some that needed replacing due to being worn nearly through), but overall it looks like it has had a lot of miles put on it which indicates it should be a good bike to ride. Plan on needing new tires and maybe fresh grease on the bearings. Offer $150 and see what the seller says, but offer it in person with cash in hand.