Yeah so I jumped in on the trend. I have to admit, it's pretty fun. Using a prism is hard though...especially when you have a battery grip on your camera and are recovering from major tendonitis in your right hand. Let's just say my arm and especially my wrist were tired after practicing for a little bit. If you haven't tried it, just watch Sam Hurd's tutorials.
I bought this prism off Amazon and it does the trick.