I'm happy with the performance of the Sonic Pro toothbrush, my teeth feel really clean after using it, but there are some inconveniences. The most annoying feature is having to push the On button multiple times to select the desired mode and to turn the brush off, specially if you want to stop to spit. It would be perfect if it had a separate button to select the desired mode and save it, and another to just turn On and Off. Talking about the On button, consider making it a bit less sensitive, it's really easy to push it on accident. While the timer is a helpful feature, it interferes whit the brushing, stopping the toothbrush momentarily every 30 seconds. I think it's a good feature, but it shouldn't stop the brush. Finally, the charger not having plug is not the best, considering the older model had one. The wireless charger is fancy and all, but it makes very easy to knock on accident the brush. I'm the usual brush chargers there is this little notch than secures it a little bit, while here the magnet doesn't really hold it too much. That would be my opinion on it.