This breast pump is easy to use whether plugged in or on battery power. The advantage was I could use it while being a passenger in a car on a long journey. It was comfortable to use and more effective and productive than when I tried a manual pump. It is easy to clean and to assemble. I especially liked the dual suction (ie. The swing) as it helped trigger the 'let down reflex' before switching to the slower suction speed. I wish I'd started using it sooner. I haven't tried the calma teat as my baby girl is happy using other bottles I'd already bought.