Bought this for my mother, thinking this would just be another portable speaker, but once she showed me how it worked I was blown away. On its own, the speaker is pretty ordinary, producing a tinny sound you would expect. But lay the gel side down on any surface - glass table works best, we've found - and suddenly the whole surface turns into a speaker. It really is as good as any Bose product at that point. The problem lies in finding places that best utilize vibrations. Windows are suggested, like in the car, if you have faith that the gel will hold on, but it also works on tables, walls, kitchen counters, floors, etc, to varying degrees of success.
Brilliant little gadget, and my mum's still using it to deafen us all, so well worth the money.