This works much better vs. an electric that I had with my daughter. I have had to use it daily for 4 days so far due to one breast being much larger/staying very full (until I pump my son is having issues latching). So far it's working great- the trick is to find the right flange fit for your breasts.
As another reviewer said, if you pump and hold instead of just squeezing like mad, you'll get a better, faster flow. I can normally empty a breast if needed (about an ounce currently) in 7-8 minutes.