This is an effect that really does fry them!
However I disagree that it can be performed within 5 minutes of somebody recieving it, I was fortunate enough to see Charles Gauchi perform this at his lecture in Cambridge earlier this year.
Yes this is his baby so it is bound to be performed well but he had a totally different handling for the routine which is a lot stronger than the one supplied with the ball.
It is not just a case of lets guess which hand the ball is in, presentation is everything with an effect like this if you dont want to get rumbled by the spectator.
If you like the effect it really is worth investing in his latest version which uses a solid silver greek coin instead of the ball, its not cheap but it is a top quality prop which looks less suspicious than the small ball & the extra something is a lot more powerful than in the original version.
If you email Charles Gauchi I am sure he will supply you with the new routine.
Also if you like Eye to Eye, it is also worth considering another 2 of his effects: The Houdini Card Mystery & Body Language which get fantastic reactions from Magicians & also laypeople.
Good review but please ensure that you put some more time into your presentation as this really is such a quick effect to learn but not to perform, I know its like christmas whenever a new effect arrives in the post, as soon as I got this I was really tempted to just go out and perform it but I sat back waited & played around with it for some more time.
Hope this helps
Cheers all.