"I used this bottle for YEARS. Literally used it with all my hamsters, and I've had four (each at a different period). Thats probably about eight or so years. No, it's not your usual attach-it-to-the-side-of-the-cage water bottle, and I like that.
I noticed that one of the reviewers mentioned that when he or she hung the bottle, it fell straight to the ground. Well, if properly hung, it will never do this. Mine didn't, and all I did was use a twisty wire (the kinds that you can get for free in the produce section of the grocery store) to attach it to the top of the cage. I changed the twisty wire twice.
Also, it doesn't weigh a half pound when filled with water. Although I agree it's not the kind of thing you want to be dropping on your hamster regardless, ultimately, when secured properly, it wont.
It's also incredibly easy to fill, never gets stale, and is very easy for the hamster to use (when at the right height). Occasionally a drop or so of water will fall out immediately after the hamster takes a good drink, but other than that, it doesn't drip.
The two componants are well made, and fit together perfectly. There is a little strip of a rubber like material that binds the two pieces together, furthur securing the water inside the bottle.
Also, the plastic never fades into a mucky yellowish color. In my eight years of owning this great water bottle, it stayed a beautiful clear and red.
All in all, I would definately recommend this product to people who are willing to access their common sense when using it."