The Effect
Four piles of cards are displayed each containing an ace, with the pack copntaining the ace of spades placed front and centre. In turn, each ace disappears from each of the packs and reappears with the ace of spades.
Cost
$12.95 (Instant Download)
Difficulty
(1=easy to do, 2=No sleights, but not so easy, 3=Some sleights used,
4=Advanced sleights used, 5=Suitable for experienced magicians only)
I would say a "3"...but not a difficult three. You could do it without the sleights but it wouldn't look as impressive.
Review
This certainly looks very, very impressive when you watch the demonstration video, which is superbly done by Oz Pearlman.
http://www.penguinmagic.com/product.php?ID=636
The secret when it is demonstrated is so simple yet incredibly powerful and one which, as a novice, I had not come across before. To old stagers, like seige

The trick benefits though from an immaculate presentation by Oz.
Rather than going on about it...watch the video.
Overall
A great trick...and although I haven't bought any...erm....any of the thing that I need to make the trick viable...I can imagine that it will fool every non-magician into believing that the aces have actually disappeared.