I went to Bing Bong's yesterday. I had the imaginary pal drink. It is pink lemonade on bottom, then grape, with cotton candy on top. You couldn't tell the cotton candy was there because it had sunk/melted pretty fast, but I did taste it in there. It was pretty good, felt refreshing on a hot day, but I don't think I'll get them every visit. It's worth a try though. I didn't hear good reviews on Sadness Cake pop so I passed on that (plus I don't like cake).
Maybe I was just mistaken but I thought Bing Bong's was going to be an entire candy store/bakery. Only one section of it has sweet stuff. The rest has merchandise that you can find over in Knick's Knacks. The Bing Bong plushies are cute though! And they smell like cotton candy.