You wouldn't want to buy this is you were after raw computational power (a single PI offers ~1 gigaflop of single digit) but you would buy this/build this if for some reason you needed a massively parallel solution. (Think Math problems) or you wanted to practice distributed computing. (Probably why a uni built it, I havent read the article)
I'm still waiting for parallela to become more affordable or release their 64 core version. Or for Jetson tk1 to stop sucking so much dick. I want moar possible threads and an updated warp scheduler on that before i buy any.