I am currently exclusively breastfeeding my 9.5 month old son, and I work full time (and have since he was 3.5 months) - I pumped frequently before returning to work to have my "stash" in the freezer as well. Currently I pump 3x a day - occasionally even 4x.
When shopping for my pump I hear rave reviews about the Medella PIS (PUMP IN STYLE), but that is a double pump and you want a single which would be the Medella swing.....I did ALOT of research and read 100's of reviews and found that the Medellas were great, but many people had problems with milk backing up into the tubing and I have 3 friends who have the same problems with theirs.
I found equally great reviews on the Lansinoh Double Electric pump (which is the EXACT same pump as the Ameda) and I bought it bc it was SOO much cheaper - well 9.5 months later it still works amazing! Two of my friends had to replace their Medellas already bc of milk getting into the pump and loosing suction and they replaced them with the Lansinoh as well.
Since the Lansinoh is the same price as a Medella single pump I would say it would be 100% worth it to get a double Lansinoh! (You can even only pump one side at a time if you wanted)....... This pump does not come with a bag, BUT it fits perfectly into the free hospital diaperbag they give you and after a few months my hubby bought me a beatiful Vera Bradley bag to carry it in and now when I go office to office for work no one is the wiser as to what I am carrying with me ;)
Oh and Lansinoh's customer service is TOP NOTCH!!!!
The Lactation consultant in our area that teaches the breastfeeding class warned everyone to stick with either Medella or Ameda/Lansinoh bc the other brands just arent up to the same standard.
Oh and I wanted to add you can use batteries in it as well which is awesome for the times you and DH go out and you can pump in the car. (My DH and I went to a football game in Orlando - it was the 1st time we left our son, and I was able to pump while he was driving down the road!)