Im thinking of purchasing a used KHS AM 1000 mountain bike of a friend,he is asking $700 for it and its in good condition regular tear and wear. Is it worth the price? and if not what would be a reasonable price for this bike model? And whats the ups and downs on these bikes? I have a hard tail 07 diamond back response comp and been wanting to move up to full suspension, i ride your normal trails nothing extreme but challenging, I need help deciding. Thanks.