I've ordered an OWLS, and am waiting for it to arrive. I've wanted my own scope/logic analyser for ages, but working (mainly) in software, could never quite justify the $$$. The OWLS price (if this thing works at all) makes it an easy decision -- $56 shipped ($50 for the unit + $6 for a set of probe clips) is almost a no-brainer.
I will report further when I've got it and had a play.
Those FPGA boards look interesting, too.