Product review (3 stars): Functional but very poor workmanship
Received yesterday and installed tested. Here are what I found out.

 Everything Seems functional, the hi-low speed switch, the light, all the fixtures were all OK. I do feel the difference between hight and low speed. The sucking power change accordingly.
Even at lower speed, the sucking power is way high than conventional rangehood. That's good part of that.
Overall design is good and simple to install.

  The reason I give a three star review is due to its poor workmanship.
Here are a few things that I noticed.
1. Rough edges almost everywhere. Some place are saw blade sharp, I cut my finger immediately when I tried reaching to the air intake opening.
2. Two motors not aligned to the center of intake opening due to poor assembly.
3. There are two plastic inner housing unit of each motor that leads the drained oily fluid to the collection pan. The housing is very poorly made, the edges are sharp and bumpy, not very circular.
4. There is tafflon-like coating on the fan blade, but the coating are uneven, a few places the base metal is exposed uncovered.

Since I only have it a day, can not tell how long this unit would last.
Based on my observation, with unit of such poorly workmanship, the expectation is very low from me.
Let's see.
I will definitely not buy another unit in this brand. There are some more expensive ones (at $400-$500 range) on the market that are much better built(both material and quality of build) and more functions. They are also make in China, but not all made in china are poor quality. Some are very good.
For a rangehood you would use daily, going cheapy might not be a good idea.