I guess the tricky thing with carbon is inspecting for cracks in the frame. Little tiny hairline cracks would actually be very hard to spot. Telling you to buy it because it's a good deal would be irresponsible. Maybe it's "a good deal" for a reason. Just saying really look it over well. And even if you do you still might not see it. Not sure I would buy carbon used. I'd buy steel used...I'd buy Ti used...not sure I'd buy carbon used unless it's someone I knew well.