i'd avoid it , looks abused plus the seatposts knackered so what does that tell you ?
what exactly are you looking for ?
Prinarily something that will do what we did in the Pentlands with out the sore wrists aftermath.
If that is not asking to much from one bike then somthing that will climb well but will still be robust enough to maybe start learning to do manuals, nose manuals, bunny hop stuff that is 30 to 50cm high and drop of things of maybe 50cm to table hight (I'm not ambitious at all am i?) would be a bonus.
Quality bike second hand for up £300-350 (but would prevere closer to 250 200 if that is realistic) can look crap but must fully functional and have the prospect of staying so if looked after. (in fact I prefer the looks of older bikes as they don't have the flying saucers/tuned car/motorbike look)
I'm hoping my Kona AA with original fork will be adequate but will probably take me months to complete as the bike station is only open 2 days a week... in fact i should be there working on it now