I've been the past 2yrs, and am debating going this year. It certainly is better than the Fremont Octoberfest and Hop Scotch fests, but pales in comparison to the Cask Fest and Washington Brewers Festival. I never really feel like it's worth it. There are a few really good beers, but it's more international swill than anything. Very crowded in a small area too, which starts to suck when you start stumbling around
The thing I like least about it is that no breweries are truly represented. There's just a long line of tables with taps in seemingly no particular order being poured by volunteers who usually have no idea what they're serving. So if you find some kind of great rarity, there's nobody there to tell you that beer's story.
Honestly, the beer selections at bars like Uber Bar in Seattle are just as good or better than this fest. I don't think the "festival" atmosphere part of it was good enough to justify spending the money on it again. Just my opinion though, I know there are plenty of people who enjoy it.
I just wish we had some fests that could compare to some of the big ones in California and Oregon