I bought this and this only and have no regrets whatsoever.
I only pump once a day, but I used to pump every feed of the day when my baby couldn't latch on properly. Once you get used to it, it is extremely comfortable. It doesn't leak at all, and is very efficient. I empty each side of my breast in 10 minutes thereabouts. Sometimes my nipples are sore because my son's a chomper, but after expressing and using this pump, they often feel much better! Not sure why, maybe because it aligns and straightens the nipples?
It is also very quiet and easy to wash and sterilize. Handy for travel, and doesn't require any batteries (huge savings there). I've used the Medela Symphony in the hospital, with double pumps, but often I find they tend to take a much longer time. I usually just take my Harmony and sit in front of the TV and pump away - lot quicker and gets your arms into shape too!