I've gone five of the last seven years. It's become a major part of the city's beer scene and now includes pop-up events held in the lead up to the festival. Definitely worth attending if you're in the area, and they've done a commendable job of constantly attracting new breweries and cideries.
There's certainly some irony to Budweiser Gardens playing host to a craft beer festival, but as Demarco noted it's likely a space thing, and a sign of how much the event has grown from its APK Live / Covent Garden days (kudos to Aaron for that). I'm bummed that I won't be able to make it this year.
"Bar people do not live as long as vegan joggers. However, they have more fun." - Bruce Elliott