I had such a great time here over the Pfingsten weekend. Even with the wet and windy weather it was pretty big (but I could imagine how huge it would be on a dry and sunny day) and I spent 3 glorious hours wandering around and picking up little curios. As others have said, it was primarily professional sellers BUT that also meant that the quality of Trödel was very good... Mostly vintage or antique with very little modern trash from people's spring cleans (lovers of architectural antiques would have a blast here). There were a few sellers that I stayed away from as I could hear the ridiculous prices they were quoting for stuff just shoved in boxes but I found many many bargains at good flea market prices (there were even 1€ tables where I snagged vintage silver plated goblets for just a euro each) and my interactions with the sellers were professional and friendly throughout. The site itself is well maintained with plenty of food and drink being offered, seating areas, and portable toilets... Tip: there are indoor toilets in the hall facing the race track, these are cleaned by an attendant and they just ask the usual 50 cents for use. I can imagine that it would be almost overwhelming in size on a good day (not sure I would have wanted to go there with my kids when they were young) and because of the amount of profi sellers it might be a market that is best visited on occasion rather than often so the stuff has time to change. I will definitely be back with a pocket full of change and my rucksack!