I have both Oral-B and Philips. Both are at least 10 years old and there
is
no noticeable decrease in runtime. I'd say i got my money's worth so far.

You've said this before. My Sonicares have lasted from two to four years.
And that's buying them in pairs at Costco.

You must be recharging them in a way I am not. How often do you drop them
back on the charger?