While it really isn't a problem so to speak in Vietnam, it is rather time-consuming for all of us every 45-90 days that have to go and come back in the same day. In a strange twist of events a major part of the reason why this has become a pain for us is because Thailand is not allowing visitors (sometimes-sporadically enforced) to come to Thailand more than a certain number of times in 6 months. Therefore the people that were doing visa runs by air to Thailand from here have had to change where they fly to. It's all rather silly if you ask me.