H.S.
I am pumping at work with a manual hand pump- the Avent Isis- and it works great. I am in the staff bathroom, which is rather inconvenient, but I will say that it's completely silent (no electric "whooshing" sound to deal with). It only takes me about 15 minutes total- it has really good suction too if you take off the plastic padding thing it comes with. I store everything in the office fridge- milk and the pump itself- in a little lunch bag. Everyone assumes it's my lunch. Anyway- hope that helps- it has worked really great for me in an office that isn't really breastfeeding-friendly. Good luck!