Do you think if someone took relatively good care of the unit (which I assume most cyclists would, it would be safe to get it used? It seems to have a long life and people are happy with it.
I reckon. Who knows? The only negative I have about the unit is that the surface scratches too easily. After I noticed that, I keep it in a sandwich baggie to protect it. It is either in there, on the charger, or on the bike. Hasn't scratched since. If you can get some type of guarantee and a good price, it is probably worth the risk. Use your credit card so that if the unit is not as the seller describes it, you'll have some protection.