Yes Free to all J Class/Premier passengers and also will be available on the Summer season DUB-AGP run. Not sure if it will be free in the J section ( Y ) service on the AGP run though. Likely not.
Speed reached was 7MB. Certainly acceptable.
Its €10.95 One hour . €19.95 for a 24 hour pass. The 24 hours is from the moment you log in and the clock does not stop when you log out.
One or two aircraft still having technical issues according to a FA on todays flight back. She said they hope to have these sorted by next week. On todays flight EI-ELA it was not fully switched on. I was only able to surf the Aer Lingus website which seems to be free. I guess thats pretty standard.