Having used the service numerous times over the past few years, I was very satisfied with fares, frequency of service and comfort. That was until my most recent experience. On my outgoing journey the bus had no charger facilities in working order, which an inconvenience on a 2.5 hr trip from Dublin to Belfast. My return journey was an absolute disaster. My scheduled 9:10 am bus from Belfast arrived at least 20mns late only to tell us customers that were waiting out in the cold that the bus had issues and would have to get another bus from depot. We then had to wait til 9:50 am before a replacement bus showed up,, out in the cold. That bus then got as far as Dublin Airport and driver then told us, that anyone going to Dublin City centre would have to get off and get on bus behind his. More time wasted, and bus then arrived in city centre 55mns behind schedule. I was booked for a train departing hueston at 12:45, I stepped off that bus atv12:31. I got the 1st taxi and tried to reach hueston on time. Due to traffic I arrived at 12:45, just as the train pulled away without me on it. I called aircoach to voice my complaint, they were not very considerate. I was also charged for a new booking on the next train as they would not accept my original ticket for train 2hrs earlier. Aircoach said on phone they would log my complaint, give me a ref # and send me an email regarding such. That was a Thursday, I never received that email til Monday, but in the email received they agreed to refund my 1 fare cost from Belfast to Dublin and would receive that within 3-5 working days. It's now Saturday afternoon and no refund yet. Furthermore no where in their communications did they take responsibility for their failure to provide the service promised, they havnt even offered an apology for my inconvenience and extra costs for their faults.