that's not true anymore. there are others available too. it's a bit freaky to have choice when it comes to something that literally didn't exist just a couple years ago.
the first one I went with ended up falling apart because it relied on a plastic bit shoved onto another plastic bit to hold it all together. the second one was one of the cheaper versions and it has a positive clamp on the top and bottom of the pump. it has a cheaper pump in it, so I'm not 100% certain it's the best choice overall, but it can't fall apart.