The preferred way of getting ISO
CD images of the Debian Linux distribution
. To Debian purists, it's genius incarnate and the best thing since sliced bread
. To most everyone else, it's a worthless piece of crap software. I'll try to explain both of these.
Basically, it first gets all the .deb packages that will be contained in an image from a Debian package mirror. Then, it puts them all into a big file and does an rsync with a CD image mirror to turn that file into an exact copy of the official image.
So what's so great about it? Well, the rsynching requires relatively little data transfer (only a couple of megabytes). Apparently the Debian fans assume that everyone has a complete Debian package mirror at home, leading them to proclaim that the pseudo-image kit is "blazingly fast" and "finishes in a matter of minutes". This may be true for them, but generally, it's a load of bull. What it really does (and what makes it beneficial) is to redistribute bandwidth-guzzling CD image downloads from the (few) CD image servers to the (many) package servers. This wouldn't be necessary if there were more CD image servers; and they wouldn't be overloaded if there were more of them, either.
OK, so now we know the benefits, but who do some people actually hate the pseudo-image kit? Because it's an brittle crock, that's why. It requires you to do a lot of manual work and get various server names from outdated lists when all of this could be painless and comfortably automated.
Yeah I know: if you don't like it, do it better yourself. But I don't think the entire concept is all that great to begin with, and the only thing that really irks me is that people are hyping a crappy implementation of a not-so-great concept.