You can show both sides of the coin. Answering questions like, "how clean is this effect?" gets tricky because without just blatantly exposing the method, it's really impossible to give someone a concrete answer. How clean a given effect looks is a subjective judgment.
I will however, offer my opinion. Since you can show both sides of both coins immediately, from a spectator's point of view, the trick is over. You were fair, your hands were wide open and clearly not hiding or palming anything. The moment is beautiful. B. J. Bueno has done an incredible job with this effect and I would be surprised if you were disappointed.
Now, I know that I'm part of the team on this site, so it's difficult for me to give positive feedback without having it sound something like, "I think this is a great effect because if I say that, you will buy it and I will make money which is all I care about because I am an evil capitalist who hates it when your checking account has a positive balance."
And if you're not convinced by my opinion (which I can completely understand), wait a few days until people receive their orders and begin reviewing the product. Then decide for yourself. Or just take a leap of faith and if you end up hating the trick, return it.
I don't know if we mentioned that yet. We do have a return policy on this site. Usually, the logic goes that if someone's opened a magic effect, they know the secret and therefore, shouldn't be able to return it. We, however, really do believe in and stand by our products. If you are genuinely unhappy with your purchase, we'll give you your money back (click the "guarantee" link at the bottom of the page for details if you would like them).
Hope this helps.
Dana
I've so much respect for this community!