We went yesterday and had a blast! It was the last day, so that may have accounted for the lack of people, but... the lack of crowds, much less smoke in the tent (the tents have open walls and are not as enclosed- i.e. locked down! as Oktoberfests) and being able to find a place to sit with no problems at all, made us love this fest more than Oktoberfest. Highly recommended.
I'm sure in the first weekend, this place can get as crazy as Oktoberfest... well, maybe not THAT crazy. But 4pm on the last day gives you open seating, super friendly germans and an oompapa band for mood music as you drink your 4,40 euro mass.
Highly recommended fest, and we'll definitely be back next year!
(my better picture of the tent was too big to post, sorry!)