Took the 705x from Dublin to Belfast. Buying tickets online was easy. Bus was about 10 minutes late to airport. Could do with better markings at the airport to designate where specific bus stops are: many people asking the concierge there where to go. Luggage was easy to load. Seats were moderately comfortable, but a bit upright leading to backache. The biggest issue was that the bus was uncomfortably warm. We started off in Dublin with air, but then once on the road to Belfast it seemed it was turned off, and we sweated the entire way - and it was only about 20-21° outside. Bus arrived on time and departure was easy.