I missed the 200 watt power rating. Yeah weak. It looks like there was some kind of adaptation of a wheel chair drive motor bolted on the bottom of the frame. I wish I coud see inside the "gear box". Adding a more powerful motor doesn't look too hard.
looks like a worm gear drive for the bottom bracket. I wouldn't expect it to be too loud. I'd be more concerned about gear losses. While worm gears are great for high gear ratios, the efficiency usually sucks. Does make for a compact and simple drive though. That rear battery/cargo-rack is nice too. Price is relatively sane too, considering it uses lithium batteries.