Pinarello is a respected brand. It's an aluminum bike, so I wouldn't really expect it to be overly heavy or overy light. Frankly, I would put weight as a more minor concern. Your primary concern is whether it fits you. What components does it have, how worn are they and how and has the bike been serviced? How does it ride? Do you like how you feel on it?
Live with intention. Walk to the edge. Listen hard. Practice wellness. Play with abandon. Laugh. Choose with no regret. Continue to learn. Appreciate your friends. Do what you love. Live as if this is all there is.
--Mary Anne Radmacher