This simple item saves me so much time.  I can multitask again.  Instead of enduring hand cramps and boredom as I wait for the bottles to fill, I can do anything while tethered to the pump -- read, type, file my nails, file papers, websurf, talk on the phone, scratch my nose.  Must-have for pumping.  Using this keeps the bottles stationary so milk does not get into the tubing and ultimately into the pump mechanism.

My only criticism:  I wish the removable shoulder straps were wider (which would be more comfortable and would let me wear the bustier comfortably as a bra sometimes at work when I don't want to bother taking it on and off b/w pumping sessions).