The design of the Jellyfish is why I bought this toy—it's a JELLYFISH! I love jellyfish. Despite the fact that it's still pretty obviously phallic, you can tell it's supposed to be a jellyfish. I don't really think it can be called discreet. You could try to pass it off as a sculpture, but most people are going to be able to tell what it's intended use is. While it isn't quite ornamental enough to leave out without someone commenting, it's still really pretty. The pink is almost translucent, contrasting really nicely with the darker blue underneath, and the whole thing sort of glistens.
Plus, it glows! In the dark! I'm a total sucker for glowing toys, and the Jellyfish does not disappoint. (FYI, the best way to quickly "charge" a glow toy is to put it in front of a blacklight: the light is higher intensity so you don't have to wait at all!) The blue section doesn't glow, which is kind of neat because it's only the jellyfish itself that lights up.
The Jellyfish is a pretty big toy. It's 7" long (6" insertable), 1.75" across at the widest part of the head, and 1.5" across for most of the shaft. The texture makes it feel even bigger, so this really isn't a beginner's toy—avoid it if you don't have much experience with girthier toys. I've used similarly sized toys comfortably before, but because of the texture I had some problems with this one.
The size doesn't make it terribly travel-compatible. It's less obvious than a realistic dildo, but less discreet than some of the artier toys coming out now. Basically, you could travel with it, but it's probably not the best choice.