I love it.
It has been around since 1979 and currently looks like this:
If your printing budget doesn't allow for colour, you can paste an image into a powerpoint presentation.
In the past I've even used photos of teachers, students and celebrities, too.
About 15 years ago I bought cheap versions from the Pound Store and laminated the cards.
I'm still using them.
Students always seem to love playing it.
I discovered today (from wikipedia) that there is a fan-made version of the game, "Guess Who: The Utley Rules".
In this version "players can only ask about the assumed characteristics of the characters" based on their physical appearance.
This sounds like it might be a lot of fun for the more able students I teach.