Poorly designed; built with low-quality materials

Even if the thumb-latch that operates the quick-release clamp had *not* broken immediately the very first time I tried using it, I probably still would rate this unit very low. This product appears able to clamp onto any tubular structure on the bicycle, which would allow you to put a bottle holder wherever you want it. However, it lacks a swivel element between the clamp and the cage, which would allow you to rotate the cage to keep it vertical (so the bottle doesn't fall out!). Since there is no way to rotate the cage, don't bother trying to clamp it onto your handlebar or your top tube, because the cage will be horizontal and the bottle (or speaker) will fall out. Pretty much your only choice is to clamp it to a tube that's close to vertical, like the seat tube or the down tube. Also, the thumb-latch on the quick-release clamp only tightens or loosens the clamp by a few millimeters, so it's not really a quick-release at all: you still have to rotate the latch 10 or 15 turns to loosen it enough to pull the clamp off of the tube it's attached to, or to tighten it enough so it stays in place (and please don't apply too much pressure when tightening it, because the plastic latch is of such poor quality material that it will very easily snap in two!)

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