I think it really depends on how well the pump fits and suits your body, because some mums do find that certain pumps just don't work as well for them even if the brand is popular. It might be worth trying Spectra or Medela, as many mums here seem to get better output and emptying with those compared to Pigeon. I'm a Medela mum myself. The flange size also makes a big difference in how well the pump empties you, so it is worth checking if you are using the right size before switching brands. That said, if you are consistently feeling engorged or uncomfortable after pumping, it might be good to check with a lactation consultant, as they can help you troubleshoot whether it is the pump, the fit, or your letdown.