I am using Usha Crisp Air Premia from long time and I have not faced any issues yet.
It has been installed in my kitchen and two bathrooms. It does the work very efficiently.
While making food in Kitchen simply switching on the Usha Crisp Air Premia removes away all the gas which comes out while making tadka and friying spices.
It is installed 10 metres away from cooking area but still it does it work.
It doesn't make any noise and does it work very silently.
Similar is with bathroom as well.
The product is very sturdy.
One major benefit is that it consume very less electricity.
The best exhaust fan in this price range.