I bought the Sonic Pro and am very happy with it so far. I have never managed to nail down a brushing pattern and the "quadrant timer" function is definitely helping me to nail that. Pressure sensor is useful and I haven't yet had to recharge so all up, very happy. Only slight criticism would be that it's a bit too easy to accidentally hit the on/off/mode button mid-brush, but avoiding it will quickly become muscle memory, no doubt. I'm also unclear whether there is a way to keep it on your preferred setting (from the 4 available) or you have to cycle through each time you use it, but maybe I just need to read the instructions better.