This is a great sleight, especially for the price.
It may take you a few hours (or perhaps
even a few days) of consistent practice to become as proficient as Mike Shashkov, but it's well
worth the effort.
C.I.C.B is fairly easy to master and totally impromptu. The box can
be borrowed, the coin can be signed, all objects are examinable before and after the effect, and you
end completely clean. For .25, this effect is well worth the money.