I already provided feedback for the Sonic Fusion machine itself. We like it really well and it does feel like we just left the dentist office after a cleaning. I do wish the replacement heads weren't quite as much as they are. I have found that ordering from WaterPik itself provides the brushes at quite a discount from the big box stores. I did find that the code I got to reduce the cost of the brushes did NOT work at any store I can access, that was a disappointment. Brushes feel good and work well for both my husband and me, we have used faithfully since I got it for Father's Day.