The left shift key is a bit wonky -- you have to press on it extra hard occasionally.  I can live with that.  Seller said battery is guaranteed 80%.  When I check battery, message is "Service Recommended."  I almost sent it back.  BUT, battery worked fine while a 4-hour YouTube video played without power cord, and I don't need more than that!  I took it to the Apple genius bar and it tested well; they didn't know what to make of the battery message.  So far (2 months) it's been working great.  It came loaded with Mojave.  I updated to  Ventura.  I wouldn't do that again.  I think I lost some system preferences that simple don't work on 2018 hardware.  But it does everything I need and it looks brand new.  The power adapter and cord look new also.