i am using Medela Mini electric but i think it is really really noisy. when i am pumping in the living room, no one can hear the TV! so i don't think u can use it in the office if u don't want others to know.
Another important thing is that it always break!!! Mine went out of order 3 times in 3 months! The motor didn't work 2 times and the adaptor went out of order once!!! It was really inconvenient and my breasts hurt (because the milk can't be released!) and I have less milk every time after 谷奶! I complained to the distributor and the staff said they have already conveyed that to the manufacturer! That means that not just my pump but many Medela mini electric pumps also went out of order lah!!!
So I suggest if u want to buy this pump, you'd better buy a manual pump also as a backup!! Also, buy the mini electric after you give birth or as late as possible, just before u need it, because the pump only has 180 days warranty!! If you buy too early, part of the warranty period will be wasted!