I am using Vguard stabilizer for my Air conditioner for the last 3 years and bought it for a price of rupees 3399.
Its easy to fix to wall and don’t occupy much space. It gives decent look.
Never faced any issue with it even the quality of color remains good.
In fact protected my Air conditioner from many power fluctuations.
It is very easy to use and there is nothing to manage manually just we need to turn on the switch.