I bought the pump up the volume pack which was on offer. I chose it because I expect to be expressing in the car when I go back to work and want battery power and manual as a backup. It didn't arrive but when I called to chase I received an excellent response. The courier was at fault and a new machine arrived next day. I was really pleased with the cup range and love that the collection bottles have a teat hole though I don't have a teat that fits without leaking so it would be good to know if they are compatible with specific teats. I find it very easy to clean and operate. Suction is affected by any kinks in the tubing or grabby hands but this is easy to fix once noticed. The quick start guide was very helpful as a first time user and in three days I feel I have cracked it. The suction level is comfortable and effective. I was drawing about 30ml during let down with a passive pump so I expected this to draw more and was surprised that it drew the same on the first use but each day it has drawn more. Today I used it for the fourth time and drew 90ml in a double pump first thing and then fed the baby from the breast 10 minutes later when she woke. I was particularly pleased as this was the first time I had tried double pumping in a different room from the baby with nothing to stimulate me except time of day (baby was napping). I think the baby has stronger suction than the pump but it keeps it at a comfortable level. I have tried another brand of manual pump before and did not get on with it so I'm really pleased with this purchase as it is both comfortable and effective with a smaller body. As I get used to it I hope to pump more each session. I was also pleased to see that the pack includes spare valves. Would buy again.