Some folks online payed more for similar used models. I think the original price was 1200-1300. Reviews complain about the front derailleur. Also, keep in mind that Dave hates treks now since his current bike gives him problems. I say, if its in your price range, go for it.

I'm not a fan of aluminum frames. I have a steel frame Le Monde. Downside is the weight, though at my weight the extra few pounds don't matter. Carbon fiber is ideal, but it depends what you're looking for in terms of speed versus comfort. The price is good, though. I'd ask what specific derailers he has on there. Good Shimano derailers alone can be worth the price he's asking.