With its 2.3×2.4×4.5-inches measurement and 11.7 ounces weight (including Memory Stick Duo and battery), the CX100 is quite exceptionally compact especially in its class. The reduction has not only been done in its size, but in price as well. However, you may have to offer a sacrifice in its usability and video quality for this reduction in price and size.
It can be called a tiny minicamcorder, but it seems to fit nicely in the pocket of your jacket. Though it’s small, you would find a lot of such stuff as lacks in the other models that also include a 10x zoom lens with the ability to capture 2mp stills.