I picked up an '09 approx two months ago with similar mileage, at just under 6200 miles. The front tire had just been replaced, and the rear had a little life left but was getting close to the wear bars. Even though it had tread left I soon realized it was scary greasy feeling, so I swapped it out to match the new front. The stock tires are not very good. It's a shame, Dunlop did themselves a dis-service supplying those crummy tires, because I suspect the stockers turn people off to the brand altogether, and they make some nice tires.
Anyway, having just bought one, I would say there's a reason it's been for sale for 2 months. It's not really priced to sell fast in my opinion. While not a bad deal, I wouldn't say it's a great deal. The used MC market is such a buyers market right now, which stinks considering I have a bike to sell. I'd say if it's in good shape, his price without the luggage should be the price with luggage/racks if he really wants to move it.
I've put a couple thousand miles on mine so far, and it's really a fun bike. Engine is really nice, transmission is geared nicely, Upright position is all day comfortable (except for the seat) and the whole package is just really a lot if fun. I was afraid it might feel underpowered, but it doesn't. It's light and the engine has a super usable power-band so it feels quicker than I ever expected.
As for the lowering, if it's the shock lowering kit, it's not hard, but will probably take an hour plus to "undo". If that's what it is, make sure you get the orig sidestand also, once lowered you need a shorter stand. I just lowered mine last night and was amazed at how nice the handling felt lowered upon testing it today. I only did it because I was really tip toed on it (30" inseam), and it was just getting old not being able to back up from parking spots, and side saddling at lights. With a new seat on the way that will put me even higher, I gave in and lowered it. I'm still not flat foot, but much more comfortable at a stop. The surprise was that the handling feels noticeably better to me. I guess its just the lowered center of gravity I'm feeling, but I would say give it a shot first before reversing if you get it, especially if your not running offroad..
'79 Yamaha XS650