I enjoyed Space Dandy and I wanted to have the tune that plays over the little prologue bit ("Space Dandy... he's a Dandy guy, in space", I expect there's a specific term for that sort of bit but I can't think what it is just now) so I picked up the OST (both sets). Luckily, the other 3 hours and 15 minutes or so aren't bad either (that particular track is a little under 2 minutes).
I'm finding it surprisingly listenable even just playing in order. I usually end up picking bits out of soundtracks and only occasionally listening to the whole thing (usually on random) but I might end up playing this one in full quite often. It is quite long to listen to the whole thing though, I don't often listen to music for that long at one time and I do kind of like to mix things up occasionally. Plus, I did pick up a couple of other CDs at the same time and it'd be a shame if I never listened to those.
I guess that's part of the problem with collecting music, it can be tough to find time to listen to it all.