The thing is, the way it's done there is unblockable. It's right inbetween trying to connect it correctly, and trying to break it intentionally. I have gotten 100% combos like this by accident because of slight delay on XBL or Kaillera, where I know the other person hold's block while being comboed. Worth the risk? No. If you are playing someone you NEED an infinite to beat, you should consider more strats and screwing up loses out on 25-30%ish. If you are messing around against someone who couldn't beat you if you make one mistake, no. I would sooner try a relaunch combo for about the same added damage.