I have been using the Clinque Sonic System Purifying Cleansing Brush for over 5 years now and love it! I use it a couple times a week and it deeply cleans and gently exfoliates my skin, leaving it feeling so smooth. I only have to change the head out every 4 or 5 months since it is made with such good quality. The battery quality is very good as well and I really only have to charge every month or so. I use it in shower as it is completely waterproof. This is really a good, effective product and I am so happy I bought it.