I had the Avent Isis Manual and it was great for the first few months. Unfortunately i got ill with a thyroid problem, broke up with DP and had to find a new place and move house with DD, all before she was 17 weeks old. So with all that stress i had supply issues and my let-down vanished for the pump. I think the combination of feeling hopeless about it and it being my hand (and thus predictable patterns of "sucking") made it more difficult and i will CERTAINLY be hiring and then buying an electric one next time around.