There's some commentary on the last two years' events in this thread[/url:o96qt586]. It's good, but you're not likely to find anything that you can't get in a decent off licence. I certainly couldn't justify travelling to Galway or paying in to it. I'd rather spend the day in Sheridan's.
And the name is, frankly, a bit of an insult.
Edit: though I see this year it's only "[i:o96qt586]in association with[/i:o96qt586] the Great Irish Beer Festival" whatever that means.