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The Genius X does command a premium for this technological upgrade and you get a little less in the box.
Oral-B Pro 570 Power Cross Action Toothbrush - Chemist Direct
There is not much difference in the size and weight all told, only a few grams but sit them side by side and we think that most would prefer the in-hand feeling of the Smart 5. So, both models come with a place to store brush heads, but the compartment with the 9000 is better than the stand offered with the Smart 6. The Pro 3 3500 offers the features we regard as essential (a pressure sensor and a timer) at an affordable price. Unfortunately, I think Oral-B and other manufacturers make it a little more complicated than it needs to be with all the different names/numbers and options.You too get a visible pressure sensor, but this now lights up not only red to alert you when you brush too hard, but green too, to show you are using just the right amount of pressure. The image below is a comparison chart that shows the main models available from Oral-B today, along with the features and functions each offer.
Oral-B electric products Find a UK instruction manual for Oral-B electric products
Aside from this the two brushes feel the same in hand, weigh the same and have the same warranty, they both come with a charging stand and 1 brush head in the box. Pro 2 2000 vs Pro 3 3000The Smart 6 travel case is better than some of the cheaper models. It is a white colour and is fairly robust.