@NawImNate - Re- RPM, it's all about the silicone coating, less so the octagonal shape. Once that wears off, which can happen as fast as an hour or two if you hit big, the string kind of goes into "meh" territory, at least in my experience. Perhaps OK if you're Rafa or any pro who can trash them after a few games, but for the rest of us, there are so many better strings out there for life span, playability, tension maintenance, etc. But hey, I'm only one random amateur, grain of salt, etc.
Will be trying Big Spin when the elbow is healthier again, hopefully in April/May. In the meantime, Ultra Cable and Firewire have generated the most spin I've ever experienced -- like cartoonish levels of spin on some strokes that in some moments have even had me thinking, "Geez, this isn't fair, maybe I should put the racquet back in the bag and grab something more watered down...?" It will be interesting to see if I can top those (have already tried TB, S7T, etc).