I have finally bought a newer version of Dyson V12 (Not the newest, newest is V15). It is sold at a discount of only $718 which is rather cheap now. It is very light and has laser light to detect microscopic dust and particles, and I could really see them now everywhere on my floor, and to my surprise, there are quite a huge amount that our eyes can’t see. It can also show you how much dust and particles suck up. I think Dyson technology is really advance and powerful. Hope it is lasting (our last Dyson lasts us for very long and is still us now), and can help with my allergy problem.