I'm not convinced that's an improvement... I mean, if it works for you, great, and thanks for sharing, but there are two major "cons" as I see it...
1) I think showing their card face down first is stronger. It allows for that "no way, no way!" moment, rather than just thumbing through the deck and saying "hopefully we'll run into one face up card - oh look, there is is". Even if you just let them react to it when it turns up, that's it, that's everything you've got to work with. I'd much rather go through a face up deck and let a thousand thoughts run through their head before the card is revealed... try to imagine seeing the I.D. for the first time and be honest with yourself about which would be better, stumbling across your face up card (hence, the climax is immediately revealed in a slightly non-descript way) or seeing one card faced down in a face up deck... "is it my card... it can't be my card, it's a gag... no... oh, it is, isn't it?! No, it can't be..." etc - far more powerful IMHO.
2) Secondly (and I think this is a big one) - the work!!!! For the minor difference that makes, you now have to perfectly count cards, or mark the deck or something!
I'm sorry, but that is not a logical change for the performer. A more involved/risky method for a briefer and less anticipatory climax...
P.S. The black X version is a Sankey idea, it's good, I use it. It combines the benefit of the face down card with the impossibility of an "altered" card in some ways, ie. the best of both worlds in terms of I.D. and brainwave.
P.P.S. I've just thought of a 3rd con to this "improvement"... with the reg'lar I.D., there are two beats to the reveal... "bumf... a card is phase up in the deck! (anticipation...) and... it's... bam! your card! wow!" (Applause, offbeat, well-defined end to trick). Compare this version - "da da! Your card is face up in a face down deck! ... er... great... end of trick... that's all folks" = weird anti-climax plus opportunity for them to ask to examine the deck.
Whereas the regular brainwave goes "bumf... your card is face up in the deck! Wow! But, there's more... bam! It's a different colour back!" I hope my bumf/bam explanation isn't too obscure; put simply, there are two moments of magic in the regular versions which spreads the effect and creates a better finis on which to pocket the deck, compared to this version which ends abruptly and I think begs the response "wow! Can I look at the deck?"
Essay over
