Any problems using Django with Postgresql Serializable Transaction Isolation?

I understand that Django defaults to the READ COMMITTED isolation level similar to Postgresql. If I do increase the isolation level, apart from exceptions raised on serialization failures, what other errors could potentially happen? Also, what errors have you come across IRL?

I can imagine serialization anomaly in Postgresql is problematic in things like financial and communication apps where the sequence of events are critical, but probably not for blogs.