buy this after try out cheaper alternative that do not really work too well . the Medela , yes it be expensive , be a awesome pump and perhaps the best we have be able to find . the pressure can be adjust base on personal comfort and the pump speed be better compare to some lighter-duty pump . no impact on the shape either , I guess if you crank up the pressure too much , it could have some impact but not entirely sure of that . the pump be not the most quiet when it run , which become a slight problem at night , but it be not unacceptably loud . the storage bag and compartment be very well think out . the only one problem be clean the tube be not easy , but that be the case with all pump , not just this one . I would highly recommend not cheap out and get a quality product such as this medelum pump , it be the best money can buy .