I bought the toothbrush as the cheapest of the iO series. It is very good in cleaning, really exceptional compared to an old but sturdy one I had in 2011 (Trizone Smartseries 5000). It has a pressure sensor that notifies you for both low and high pressure with the LED. Of course, this iO is not as advanced, but it does the basic job. I don't have an opinion on comparing it to more recent cheaper models, but I was satisfied.

Regarding the battery, it lasted for two weeks. In the beginning, it lasted about 10 days (I brush a lot, it gives 2 weeks with 2 minutes per day, I did 3 minutes per day, so it was excellent). After 2 weeks, though, it lasted a maximum of 2 days. Plus, it took 17 hours to charge!! (Within specs, Oral-B says 16 hours).

I contacted customer service and they told me that it hasn't been imported to Greece! However, they assured me that they will take care of me! Note that my issue seems to be extremely common, from what I understood. Oral-B's service is exceptional. They gave me what they had in front of them, a Series 8. It had an additional screen (whatever) and a motion sensor to guide you in the app (it's fun when it works, but it's not for compulsive people like me because it will wear off the enamel before everything lights up in the app), and most importantly, a fast charger. It charges in two and a half hours. It lasts for about 8 days. Also, it has a more premium travel case.

The Series 8 is not worth double the money or even +50%, but the fast charger is truly a game changer and should be in all models. You can't wait for 16 hours for the brush to charge, and charging it after each brushing leads to the battery's dissolution in a maximum of two years, as I learned with the previous one where I rushed to have the battery replaced to recover the investment I had made.