The used ones are an EXCELLENT deal as long as battery health is good. There isn't much else that can go wrong. If you can find a Long Range or Performance model with Full Self Driving already loaded that would be a huge plus. I was looking at used Model S Plaids the other day and they can be had for 60% less than retail. I found one just two years old with 23K miles on it for $48k. This goes from 0-60mph in 1.9 seconds. It's a rocket ship. Totally insane.