If you are going back to work, you should definitly consider using the Medela Freestyle breast pump and here are the Reviews.
First, it is the closest to the baby feeding so the machine prolongs the supply of the milk. It is very easy to use and it comes with the ready backpack. On rare occasion few people had problems with machine, but overall they liked it even with the problems.
of course you might feel a little out of place with the hooked plugins on your breasts, but it just comes with the teritory.
Plus since this is a very expensive item, did you know you can get Breast Pumps at the Discount
Just make sure you get the warrenty with it, cause some people did report that medela freestyle breast pump broke down.