If the astronauts could eat something akin to "real" ice cream, they'd be eating "Coolish". The concept is ice milk that you squeeze up and eat out of a tube, because we like our ice cream eating experiences to resemble things like dispensing toothpaste or hemorrhoid cream. The package is a plastic-coated foil packet which houses some ice milk. You can't eat it immediately out of the freezer, but rather have to let it sit for awhile or warm it with your hands. It won't come out through the tube at the top unless it has thawed a bit.
The ice milk itself has little bits of ice crystals in it and has a texture which is more akin to kakigori with cream or ice cream on it than pure ice milk or ice cream. Kakigori is Japanese shaved ice, which is quite popular in summer and is sold in various presentations. The ice crystals add a unique textural dimension, and I liked it, but some may find it distracting.
Yes, that's a very attractive delivery system.
The taste is of strong vanilla and it's quite sweet. It's actually quite delicious, though I doubt that it is coming from real vanilla beans. It's also only 152 calories, which is on the lower side for ice milk. I'm guessing this has to do with the way it is cut with ice crystals. This is a low-end product and sells for 100 yen (about $1.24) for a 140-ml. portion (around a 3/4 cup serving). Real ice cream in Japan tends to cost 3 times as much.
The only problem that I had with this was that it gets softer and softer at the end and unless you're sure to have the tube right in your mouth every moment you're squeezing the packet, it'll surprise you and squirt out on your shirt or pants. Well, that's what it did to me. Also, frankly, suckling on the tube feels a bit weird. I think this is supposed to be similar to a lot of sports drinks in Japan in terms of the experience of consuming it. If you're walking around on a hot day (something that happens a lot right now), this is probably a convenient way to enjoy a very cold snack, but it still makes me feel like I'm still on the bottle. That being said, I'd buy this again as long as I could consume it at home.