Pros: Pumps milk quickly & quietly.
Cons: None so far!
I have been using this pump for a week and I have been very pleased. Originally I had been using a low grade dual Evenflo pump (which I HIGHLY recommend not buying) that had been given to me by my sister who had only used it once. It had practically died on me, which gave me an excuse to buy another, one that did not take over an hour to produce 4oz of milk! Now, I can pump that in at least 15 minutes (my milk supply had been reduced by a little over 50 percent while using my previous pump).
I have not yet used the battery pack yet, but I recommend getting rechargeable batteries. My other pump would completely drain the batteries before I could even pump a couple of ounces, but I have heard that the battery pack for the Medela lasts multiple pumpings.
I have yet to see an increase in supply, but I have heard that it could take a week or two, but I love this pump and would recommend it to anyone who is planning on buying one. Yes, it is one of the more expensive pumps, but I wish that I had bought this months ago to save my precious milk supply!
Before you buy check the prices on the internet! Many sites offer free shipping and most compete with each other.