[This review was collected as part of a promotion.] I still own the Diamond sonic, it is 12 years old and can't hold a charge, but it still works. I went to buy another one and I discovered that it has an app and other things that I don't need. The 4100 has all that I need. Two power modes, and a two minute timer. To my surprise, it doesn't come with a wall plug adapter, but I spent some time on the phone and Philip sent me an adapter free of charge, a bit inconvient but it wasn't a big hassel.
[This review was collected as part of a promotion.] Used Sonicare brushes for long time and they are excellent products. This particular item seems to have a software malfunction where it reverts to the training mode after every charge. Then I have to manually increase the brushing intensity to full. Other than that, great product!
[This review was collected as part of a promotion.] I love my new Phillip Sonic 4100 toothbrush. My teeth are much cleaner than by previous rotating toothbrush and my old manual toothbrush. I also am very pleased with the 30 second sub-timers to let me change to a different set of teeth in my mouth. Makes the brushing seem like less time.
[This review was collected as part of a promotion.] Purchased the 4100 series sonic toothbrush for both my husband and I and we love it! The toothbrush has 2 speed settings, an automatic timer, and a very long lasting battery. We highly recommend!
[This review was collected as part of a promotion.] Great features. Long battery life. Bought two of these to ensure better dental care. Pleased with the action of the brush, the beeps to change area being cleaned, ergonomics and overall level of noise.
[This review was collected as part of a promotion.] I needed a newer one so I got this as a Christmas gift. I am very happy with it. Has two clean settings and leaves your mouth feeling clean and it tells you when to switch. I have charged it once since January .