Does it leak around the part where you screw it on to the bottle?
Mine does and it drives me nuts! I'm not sure if I have a faulty pump or if all of them are like that... It's annoying that I have to be so careful to keep the thing so level so I don't spill precious ounces! :-(
Re: If you have the hand-held Medela pump...
Yes! Oh my gosh... I guess you can't trust every review you read, eh...
Stupid Harmony...
Mine does unless I screw it on VERY tightly. I feel like I'm going to break it but thats the only way it does not leak.