Jars work great. Not as sightly but you can see the level of feed and easy access. You don't have to enter to place on and then re-enter to remove old bag. Here in the south no need to use top super to cover. I have not had freezing issues. Tille has a little more harsh weather than I but not much. If looks are an issue place another deep over top of jar to hide it, you have to place a spacer or at least a shallow over the top of the baggie anyway.
Baggies are easy to transport but will sometimes lose their seal. a milk crate makes carrying the jars easy or a new 5 gal gas can with syrup and fill in yard. Baggies if the hive is not level or the baggie incorrectly filled will spill over the sides and leak. Hive being level is not an issue with jar feeders --- you just have to have the right amount of holes to create the right vacuum to prevent leaks. Also no extra space created for the bees to burr or remembering to remove bag.
In the time needed to put a baggie on, you could put on a plywood top with correct size hole for jar and be set for the rest of winter :-D! Just remember to put a small spacer around the sides of the plywwod, the jar lid will fall down into it and the jar will support itself.