You're missing out if you don't take advantage of what it has to offer. An invisible crimp. The ability to follow their card wherever it goes, even after they shuffle.
Actually some people's riffle shuffle will mess this up.
And I find crimps, controls, and even palming a card off more practical then the one way on these decks. It's not in my interest to have to take the time to find their card again after they shuffled by going through the deck and finding it.
I could see it useful as an upside down 'pulse jump' effect, you wouldn't even need to know what their card was. You could also reverse certain cards and 'randomly' select the 4 aces...overall I still won't be using this.
Aviators are also 1 way...just sayin'
-Rik