Lazy WP said the worst thing with an upright is that things can fall out on your feet. In my opinion, the worst thing is that every time you open the door all the cold air falls out and is replaced by room temperature air. Big jt mentioned freezer burned meat with a frost free upright. Any upright is more likely to cause some freezer burn than a chest type, but a frost free one doubly so. An upright freezer can't prevent moist air from getting in when you open the door, which is what forms the frost. Think about how it gets rid of the frost and you'll realize that it allows many more warming cycles than a non-frost free, particularly a non-frost free chest type.