Sure, you probably have all of these songs on different albums—but this does all the hard work for you, by putting them altogether on one disc. These are mostly songs that I would put on a "mix" album if I were making one—with a few songs that I wouldn't necessarily choose, just to add some spice. Heck, they even threw in the "Death of King Arthur" po-angliski for our enjoyment. If I were trying to convert someone to the delights that are Grebenshikov and Akvarium, I just might use these collections to do it. It would be painless to lend them out. (If I never got them back again, I still have the songs on their original albums). And the discs definitely provide a great representation of songs.
Finally, at something like $6 a shot, the price is just right. Altogether, not a bad idea to have in one's collection.