This is absolutely excellent when it works. Demo batteries have lasted longer than I thought. Serves great as a torch as well (though only in the dark) there has been many a night I've enjoyed using it to go downstairs for a drink. Only one design flaw is that the button doesn't work when in extended mode and the alternative big red button at the bottom needs to be used, a flaw that could have been easily fixed.
Sadly there are some problems with the sounds. I've also read about it in some forums as well, that the sound cuts out and it's a fault in the electronics. Somehow, without them, it just doesn't feel... "sonic".