Personally, I prefer REF4M to reinCARDnation, since even in maker's performance, I find the latter to be kind of obvious to spectators. I have had audience members, even young ones, figure it out, simply because the moves involve covering the cards at a time that draws attention to what's actually going on. REF4M also involves a tear up at the end, and the tearing process is a bit weird, but it's much cleaner, and there's no obvious moves.