I got these as the bras I bought during my pregnancy I quickly outgrew and was unwilling to keep shelling out the money to keep replacing them!  pay attention to the sizing noted in the description to ensure they will work with your bras (the only negative thing I remember when reading reviews prior to purchase).  I used 2 and only washed them on weekends and had no issues with smell (but if you are worried buy an extra set so you can wash more frequently).  I hand-washed and line dried and had no issues with the quality.  Overall exactly what I needed!