Put this flatly on for extra float,
921853
Put this flatly on for extra float, it works well as I have a light attachment that is really heavy
1601115
Easy to install, deducted a star because the floating cover is not big enough to cover the hole in the ceiling
685338
I bought the wood to attempt to lower the ph of my fish tank with the natural tannins. However, I just put them in the tank, so I don't know if the wood will have much of an effect for a 20 gal. tank. It would be nice if they helped a little bit. I did not give the item a total of 5 stars because if I remember right, they were advertised as non-floating . . . and they all float. Still, it's a pretty addition to a fish tank for a more natural look when weighted down.
1575141
This accessory is sort of an insurance policy when you take your GoPro diving.  I took this diving with a POV pole attached and while it didn't have enough added buoyancy to float with the pole attached, it make the sinking speed MUCH slower.  When the GoPro camera is by itself or with a small surfing clip, it'll float to the surface easily.

Honestly, the only thing I can think to gripe about is that it comes in pieces, so you are left to have to attach the sticky tape to the GoPro's backdoor.  When I did it, I placed it too high such that the water proof case's clamp snags the top of the floaty material when I close it up.  Minor, but I would double check if I did it again, so definitely check the clamp's fit when you attach yours.
2788731
utilized with the Weatherguard Evaporative Cooler Cover for extra insurance (so it would be harder to take flight)
2117594
I used this as a floating fireplace surround and it turned out better than I had hoped it would.
2761028
a nice little float for your water proof camera.
993996
Works well, doesn't float away. If it did float than I imagine you could tweak it (e.g., attach a weight underneath). I was prepared to do so.
4828661
works as advertise ... more traction and a bit of protection for your Sphero. i haven't tested it in water yet - but i want to!
682206
add a few more screws to support as base is pretty light, but looks great, sure brightened up the bath
4326380
Could use a small weight on the bottom... It tends to stay on its side when in the pool
2321402
These floats are actually designed to be useful. It has a sturdy, easy-disconnect clip for when you don't want the big foam loop.  One float easily keeps my Olympus TG-5 camera from sinking.
3896765
It is being used at our pool. I would buy a nother one if I needed it. It looks just like the add.
3078407
Very thin, which is okay but it would look better with more weight to add depth to the design.  Looks very inexpensive.
3742551
Works just as expected, adds that needed flexibility
3718772
It want to float even with all air out. Had. To put brick on top to stop it from floating
3231330
If you have an aquarium like enclosure, you may have some trouble clamping this on the side if you keep the screen cover like I do. But when there is a will, there is a way. You can always clamp this to something else if it won't clamp onto your enclosure.