This is the one that changes how you think about vacuuming.
 

Both vacuums have automatic dust sensors that adjust suction in real time — more power on dirty spots, less on clean ones. Smart. Efficient. Both do this.
 

The difference is what you see.
 

Dyson shows dust particle data on a small LCD screen on the handle. You have to stop cleaning and look at the handle to check it.

The Achaté projects a green LED light directly onto the floor. When it detects dirt, the light gets brighter. When a spot is clean, it fades. You see — in real time, on the actual surface — exactly where dust, hair and allergens are hiding.

Under the sofa. In dark corners. Along skirting boards. On dark rugs where dirt is invisible.
 

Every tester said the same thing: "I thought my floors were clean. I was wrong."
 

When the green light hits a spot you just vacuumed and lights up with dust you couldn't see, that's the moment you understand why this feature exists.
 

Proof that the job is really done. That your toddler can crawl across that floor. That pet dander isn't floating around anymore. No more guessing. No more hoping. You can see it.