The description is essentially accurate (although one doesn't show the queens in the envelope ... one can show the envelope and say "I have the four queens here").

It's somewhat similar to B'Wave, with a slightly different payoff and a slightly different "price".
B'Wave has two extra "payoffs" after revealing the face-up card, Dream Queen has just one, plus a slightly awkward extra "convincer" subtlety. But, Dream Queen lacks one restriction of B'Wave.

Like B'Wave, repeating it would generally be a bad idea, although it could be repeated a slight bit sooner than B'Wave.

The cards look like Bicycles, but don't have the nice feel ... they feel more like cardboard, making some moves you might want to do more difficult.
They're also a bit thicker than standard Bicycle cards.