They're pretty much completely awesome; the top lights up and changes color, and the tentacles are made of glowing fiber optics. They'd be the perfect decoration for all your pool parties! Unfortunately, they aren't remote-controlled, nor do they squirt water at people. That's why I classify them as "pretty much completely awesome" rather than "completely awesome."
The price, at $59 a pop, is also not particularly ideal. Oh, well.
But on an unrelated note, when I think of "jellyfish" and "parties," I typically think of that String Cheese Incident song that describes the aftermath of a tequila-infused night with the lyrics "now all I really want from life is to crawl back into bed/on account that my brain is just a jellyfish in the ocean of my head." Kind of profound imagery there.