I bought one of these at my local Asian supermarket for a song, having previously used a Krups coffee grinder with excellent results, but which was tricky to clean.
This just doesn't do anything very well. The design of the blade/bowl struggles to pull anything in, so typically you get a thin layer of liquidised material at the bottom, whilst everything else remains untouched just above it. So you open it, stir the stuff around with the spatula, and try again, only for the same thing to happen. So you scrape it all out, and chuck this in the washing up. It can't even catch/grind peppercorns!
I didn't have any technical issues with it, unlike some other reviewers, but I can see how the coupling and activation could be problematic for some people, especially if you have a weak grip or slow reactions.
It's a shame, as it's a potentially useful product. A Mark II version that had actually been tested might be worth a look.