Bought one of these from a Hong Kong seller on ebay the other day for the princely sum of £23 and free postage, received it yesterday, set it up which took a minute or so and had a play.
It fits neatly onto the camera hotshoe for daytime use and is very straightforward to use, a single light press will focus the camera and a further press on the button will activate the shutter, there is also an option for 2 second delay built into the unit and bulb mode for opening and closing the shutter manually.
It will apparently work up to 100 metres, although I haven't tested this to date.
Here's a couple of pictures.
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