I buy most of my albums without listening first(all the albums I've ever loved have been from me doing that), but sometimes I'll listen to a few songs on Youtube or something before I buy, but I never listen to the whole thing. I love the element of suprise when you listen to an album for the first time, not knowing what to expect.
In this particular case I'm going to listen without buying, because this band sounRAB like something I could really get into.