I only ever had an electric pump - tommee tippee one that I got half price from mothercare or boots when it was on offer - so can't help with that bit I'm afraid.
I am pumping with a manual tomee tippee one, getting between 5oz and 8oz per time so I do not think they are rubbish. However, it takes upto an hour to get 8oz. Thinking of investing in an electric one, just to save time really.
Ah this is the one I bought coz all my bottles are tommee tippee I just assumed that I would need one that fitted them
*facepalm*