I flew Aer Lingus only once, way back in 2002 but I loved the flight :-) It was kind of funny though, there were a bunch of rowdy irishmen on the flight and I ended up getting maybe 10 mins of sleep total!!! People were up and out of their seats *constantly*...the flight crew had to get on the overhead speakers three or four times to reprimand people ("PLEASE BE SEATED!!") and get them back in their seats. It was interesting to say the least hehe :-).
But oh yes, the airline itself...lots of green! Comfy flight! I'd definitely recommend it :-)