Ah, well I *had* one of those. Took me ages to find someone to give it away too! ;-)
A bit like:
They have a very short stroke, and fairly fine teeth so cut very slowly. They use B&D single source blades that are expensive. They vibrate excessively. The larger saw looking blade tends to set up side to side vibration so much that the end tends to hack a wide trench out of the wood rather than cutting it. It has a jigsaw mode where it behaves just like the worst jigsaw you have ever used only not as well.