I got my first medela manual pump as a gift from my midwife back in 2005 and recieved another one as a gift after I had my second baby in 2007. Both times it was a disaster.
First off, the cone/funnel is too small for a larger breast, even when you take off the cover -- it says it's adjustable for larger and smaller breasts but mine only adjusted DOWN with little inserts and I really needed it to adjust UP! The circumference was just not wide enough to support enough of my breast.
This pump caused a lot of pain for me, the few times I got it to "kind of work" it would only do so for a few minutes and either the valve would poof out of place or my boob would slip out of it LOL
Not to mention it cause severe pain. Did I say that already?
I know a lot of people swear by medela, I am not one of them. This was always the most "highly" recommended product for me and it was always the worst. I know the brand is very popular and it might work well for some, but I just want you not to be mislead and spend a ton of money on an electric medela and find out it doesn't work for you either. Try the manual pump first before you make a larger investment!