I just unpacked - it looked good to go so I lobbed it into a cup of water and plugged in the USB - instant plum of 'smoke'. I've tried taking pics but it doesn't show up well in the photos.
It's got a small port of the bottom where the water goes in that I imagine is easy to block so a bit of TLC might be needed occasionally.
It's great that it's only 5v - like you say, all the others seem to be 24v and loads of power. I'm chuffed!