Good design, worth paying the extra for
I prefer these to the standard drinking water bottles because they have a pin that drops down in the spout rather than a ball bearing. I find this works better as with adding supplements to the water for guinea pigs, sometimes the ball bearing doesn't seal well and the bottle leaks. I also like that you can fill the bottle while it's attached to the cage as it has a lid rather than trying to tip up and juggle a full bottle into place. The holder also means that the bottle is easy to remove and replace on the outside of the the cage for cleaning and filling. On the downside, the shape of the bottle means it's a little harder to clean, and the plastic is possibly not as strong (I dropped my last one and it cracked). Still worth spending extra for a new one rather than the standard cheaper version though.
Verified purchase: YesCondition: Pre-owned