I bought the first DiamondClean about 8 years ago, and it made such a difference in areas that I couldn't get properly cleaned manually. My teeth feel cleaner, look cleaner, and the dentist also noticed the improvement.
Unfortunately, the old toothbrush had a couple of falls onto the bathroom floor over the last months, and stopped working properly. So I bought the latest generation of this model again, because (1) it really cleans well, (2) the previous one lasted so many years, including the battery performance.
I decided to stick with the same model, rather than upgrading to a "smart" brush, as some of the reviews suggest that the smart technology isn't quite mature yet, and I'm quite confident I know when and where my teeth have been cleaned properly. So no need for the additional expense.
Regarding the five cleaning modes, I end up only using the same one, but other members of the family might use different modes so I suppose it's good to have the choice.
Slightly disappointed though that the new model comes with a plastic charging puck though rather than the glass. And of course bear in mind that the brush replacement heads come at a cost; however, my advice is to use the original Philips heads, I have tried some of the cheap replacement heads in the past but they don't clean as well. Just look out for sale/offers and get them at a more reasonable price.