The value depends on the model, condition, completeness and upgrades / accessories. A picture or serial # would help. Short of that, you can compare this boat with what you see on the Hobie website. On an older boat, you want to look closely in the drivewell area and inside the hull at the "cam columns" for any cracks. These are high stress areas. An inspection of the hull bottom gives a good idea of how well it has been cared for. If it's a Sport, it has a short cockpit so if you're over 5' 10", your legs may be too long to pedal effectively. If you get to try it out before buying, look inside the hull afterwords for any leakage. Good luck!