I've generally charged to 100% (not counting the buffer), but I've read on a Nissan Leaf forum that some seem to limit their charge to about 80%. Not sure if their reason is because of the Leaf's poor thermal management system, or some other reason not to "fill up".
Probably doesnt matter to most of us who lease because I doubt there would be any problem in just three years.
Yes, I'm thinking about a used Leaf. Many 2-3 year old Leafs in the $10 - $13K range. I don't drive more than 20-30 miles per day so I'm not needing an expensive 200+ mile EV. The 500e has been great, but my wife is saying she would like a slightly larger 4 door.