Like other Bluetooth 2.0 speakers, this one's rated to have a range of about 30 feet but I managed to stream music from my iPhone to it from about 50 feet away without a problem.
While the G-Go isn't being marketed as a shower speaker, G-Project says that it is "designed to be used in kitchen, bathroom, beach, pool, patio, and other environments with potential exposure to water." To reiterate, submerging the product in water is a no-no, though a spokesperson did tell us that if it was "in the shower with you (off to the side) and it got wet, it would be fine."
The sound was about what you'd expect from a $69 Bluetooth speaker: OK but not great. It just doesn't have a lot of detail or particularly punchy bass and when you crank the volume you'll get some distortion. At mid- to lower volumes it's just fine for casual listening and those with less discerning ears will probably think it sounds pretty decent.
While the G-Go's sonic capabilities didn't exceed my expectations, the value proposition here is really the design. It weighs 2.3 pounds (with batteries installed) and with the built-in handle it's easy to carry from room to room or outside onto the patio. Again, you shouldn't expect to get big booming music out of this speaker, especially outdoors, but for basic listening in the bathroom, at the pool, or at the beach it performs fine.