Okay, if you're a Radiohead completist you're going to buy this CD regardless. But it's not worth the cash IMO.
Don't get me wrong, the songs are excellent as usual. "Just" is one of my favorite tracks from The Bends. And the "Mogadon version" of Killer Cars is a very interesting interpretation, almost a single-worthy mix.
But you already have "Just", and if you have "Killer Cars" on another CD single or bootleg it's not worth buying. Radiohead are known for releasing b-side gems to their fans on their singles; this one falls short of better efforts like "Fake Plastic Trees [US #2]", "Street Spirit (Fade Out) [UK #2]" or "Pyramid Song Pt.1".