I can’t express it better than John Brownlee of FastCoDesign does:
Tragically enough for the 12-year-old inside all of us, there are all too few opportunities to whip around a pair of nunchucks in contemporary adult society.
You can buy real nunchucks and flip them around to show off your skills, but then you’ll be asked to leave the public library. The Trick Cover case for the iPhone 6 is a great alternative. Flip it around like you’re a real martial artist.
As this promotional video shows, it could actually be useful. If you need to open and close your phone quickly with only one hand, the Trick Cover will do the trick. If you need an actual weapon, then you should probably stick with the iStab.