Never, ever, ever eat green ones. If they are that ripe, may as well squoze 'em, make fermentables with the juice and feed the pomace to the chickens and pigs.
Hangover beats 2 days on a throne.
/johnny
My pear tree which produces the good ones is a Bartlett.
They are more than good enough to eat raw. They are a treat.
The sand pears are just the opposite. One year I gave them all away to a guy who fed them to his horses.