6C on the 319 is perfectly fine. The foot cutouts help, as does the fact of not having someone to recline into you. Add in being at the very front of the coach cabin, speeding up deplaning, and it is one of the best seats on the entire aircraft (first class excepted). The one downside is if you are otherwise interested in watching the in-flight entertainment. If so, you will probably not be thrilled with 6C.