Bike should be just fine, if it was maintained correctly. You didn't mention the price $$$ they are asking. Ask for any maintainence records, check the manufacture date on both tires, and tread depth. Try and get a look at the engine oil, get some on your finger, and give it a smell. Check for a "burned" odor. Look for any leaks, engine, radiator, and have a look at the final drive oil, if you can. Ask for the proof of the brake recall being done and the condition of the brake pads and rotors. Put the bike on the centerstand, and rotate the rear wheel, check for brake drag. If the bike was kept up well, all should be good!