My expectations when trying the Oral-B Genius 8000 Electric Rechargeable Toothbrush, was that it wouldn't be as good, or at least equal to the rechargeable brush I was currently using, that quit on me, so I wasn't prepared to be wowed by what this system could do. I thought my teeth felt pretty good before, after using my current model, but after using the cross-action head and being guided by the sensor ring and the Oral B app on my smart phone....yes, it connects by Bluetooth to your phone and tells you where you went wrong....I was quite impressed by the 'just cleaned by the dentist' feeling. There's a lot going on with this brushing system...you have 3 types of brushes, many options as to the type of 'brushing' you want to do, as well. The travel holder can also be plugged in to the wall and supports a USB, in which you can charge your smartphone from. I don't think I'll be using the smartphone app as much, as I'm usually rushed in the morning and don't want to take the time to set it up (smartphone holder attachment for the mirror included), but the fact that the smart ring is equally helpful on its own, is a plus. This is a well thought out system to help get the best brushing experience you can achieve, that is comfortable for you. It's a bit pricey, but considering what you get in accessories, and the results of what you can achieve, it is well worth the cost.