So, I did not buy a car from them, so I can't say for sure.
Some people on yelp have had problems with the car, and they offer a return on the car, and they make it right.
I would read the terms and see what they are saying they will do, versus just an act of good will.
Also they do not sell older cars, so the factory warranty will transfer with most of the cars on their website. The person who buys my 2014 will get the factory warranty transfered, as well as whatever beepi says they will warranty.
As for "lemon". If that is something that would appear on a vehicle history report they do not take cars with anything weird with the title, any damage, or any buyback lemon cars.