Have used the Philips Sonicare brushes for years. Currently using a Healthywhite.
After the first week there was a definite difference in the colour of my teeth (using the same standard MacCleans toothpaste).
Teeth feel just like they do after a polish at the dentists.
The timer/mouth zone function ensures that you concentrate on each area of your mouth for the recommended time.
You don’t need the all singing and dancing functions. I use Clean usually, and Clean and White occasionally.
There are a number of different heads you can use from the pro range. The Interdental are supposed to be more effective.
You don’t need to press the brush against your teeth that hard, so your gums are less likely to recede.
Last one lasted over four years before the battery died. Unit is sealed, so not user serviceable.
As said above, never pay full price. There are usually offers on in one place or another. They keep coming up on Amazons Christmas deals.
I picked up 18 months refills in the Amazon Black Fridays deals at a very good saving.