This product really does look like an actual paper cup, to the point of startling people with its un-paperlike sound when you set it down. For these reasons, it's an excellent conversation piece, or starter, or ice breaker at the office.
The cup itself is approximately the same size as a so-called "Grande" paper cup at Starbucks (or "Medium" anywhere else). At 10 ounces, however, it holds far less coffee -- less even that that in a Starbucks "Tall" (or "Small"). The reason for this is the large amount of insulation in the cup.
Other than that, the cup does its job. The one complaint I have is that the rubber lid gets easily stained; make sure to wash it frequently and completely.
One last note: for some reason Amazon rates this product as a "toy," and therefore asks reviewers to rate its durability, "fun-ness," and educational value. Hence my attempts at reviewing for such aspects.