Yeah, generally good experiences with Aer Lingus. I've flown them to Munich, Rome, and Paris over the past few years and we're flying with them to Madrid in April. It helps that they fly out of Hartford now, which is way more convenient than Boston, though I have flown them out of Boston, too.
I had one really annoying issue. When we went to Rome we flew overnight when Europe was starting Daylight Saving Time, so the time change was occurring during our flight. Aer Lingus apparently didn't consider this when originally making their flight schedule. About a month out I got a notification that our connecting flight was changed and now we'd have like an 8 hour layover in Dublin instead of about 1.5 hours. I was confused, as our original connection was still bookable, then realized that they hadn't accounted for spring forward and that connection would've only been about 30 minutes. They didn't do anything to compensate us for that lost time. We had thought we'd arrive in Rome that day with time to explore, instead we got to the hotel and went to bed.