Pros: Good pumping power, Convenient for Avent bottles
Cons: Tiny valve always pops out, lots of parts needed
With my first child in 2002 I bought the Avent Manual pump and after the initial period of getting used to the assembly and method, it worked like a dream and helped me to breastfeed and pump for about two years. I used the Avent bottles as well, so it was perfect. It was also pretty hardy as I also got to use it for my second child in 2005, also for nearly 2 years. I always handwashed it, and used the steam sterilizer for about 7 months, after which I simply poured boiling water.
With my 3rd child in January 2008, my trusty old pump finally gave in and cracked about a month after my son was born and so I purchased the new Avent Manual pump. There were less pieces now, which I thought at first was a good thing, but like the other reviewer here, I have been having the exact same problem. After a few movements with the pump lever, the tiny piece for suction pops out and you have to open the entire main peice to put it back in again. Obviously its' a problem with the design and I'm wondering if Avent has done anything about it yet with so many Moms experiencing the same thing?
I bought a Medela pump and found it takes me twice as long to achieve "letdown" in spite of it being electric, so I've continued to use my Isis even if the "popping out" bit sometimes drives me crazy.