I choose this pump by process of elimination base upon negative Amazon review of other pump : - the Medela have bad review indicate milk get in the tube , and a friend who have one confirm that this can happen . do not want to deal with this . - the Ameda and equivalent Lansinoh have negative review on a obnoxious beep sound during operation - this sound rather annoying . the Avent pump 's negative review just seem like miscellaneous whining , or random malfunction -lrb- which can happen with any brand -rrb- . so I go for it . my wife be not thrill with the Avent pump . the feature to customize the pump rhythm seem to be both unnecessary and a burden . she want to just turn the pump on and let it run , not mess with complicated control . once you mess with the adjustment once , you can never really get back to the factory setting . also , the pump be pretty loud -lrb- louder than the Medela hospital grade pump we rent -rrb- . further , the pump be not compatible with the glass bottle I buy , and adapter be not available . we probably would have keep the pump , but it die in less than 2 week and 10 use . the pump simply do not pump anymore , and the internal be loose and rattle within the pump housing - something be break . send this back , will try the Medela pump in Style .