Sollatek spike guard: as safe as stabilizer?

Bought a microwave recently, and for the past few days the voltage has been spiking intermittently so I guess I do need some protection for the M/wave

Has anyone used Sollatek A/C Guard Voltage Protector | Voltage Stabilizer | Flipkart.com ?

Costs about 1.4k and claims that it will cutoff power if voltage goes too high, do these actually work as claimed?

(I understand that the device will switch off when voltage is high instead of operating on corrected voltage. Thats OK with me)

Also, any other online source of stabilizer or voltage cutoffs that give better price than Flipkart?
 
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