This is the first effect I've ever purchased that told me to try it on myself before reading the instructions just to see how magical it was. You have to give them credit for that. Unfortunately, the effect didn't work right for me when I did it on myself, but after learning the principles I was able to perform it flawlessly for others. This is truly a simple effect that really makes it look like real magic has occurred. There are no fancy moves on your part other than just keeping pressure on the deck as you fan it out to show their card has vanished. You are dealing with a variation of the rough/smooth in part of the deck, and it has a tendency to not work without a good amount of pressure on it. You're not breaking your fingers with a vice grip or anything, but it's definitely not a Mirage deck.
The effect is good, but It's not perfect. The deck can't be examined afterward, and unfortunately the effect can't be performed with a signed card unless you can dupe the signature. If you want to change the ending slightly, it's possible to do a switch with a signed card for the ending, but then you wouldn't need the KONA deck since you're controlling the cards. Also, this is pretty much a one-time one-trick deck. It's impossible to repeat this trick or even perform it around the same spectator, and you'll have to do a switch immediately afterward if you want to do something else.
This effect does have potential, and if you're not the greatest card handler in the world then this is a nice way to put a card trick into your act with a minimum of practice.