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.
Other alternatives include the Logitech Mini Boombox and some of the other compact Bluetooth speakers, which retail for around the same price or slightly more (see our roundup of best portable Bluetooth speakers for under $100). The advantage to those models is that they have a rechargeable battery, and they're very compact. They might not offer quite as much sound output but they're not far off. If I had my choice, I'd probably lean toward the Mini Boombox, but I do like the G-Go's industrial flashlight look had people asking me, "What the hell is that?"