@lalitk Thank you. I don't think these products are indispensable, I do think they make a subtle but discernible improvement-a bit more clarity and presence. When I've removed them, its not as good but certainly not night and day. The better power you have, I suspect the less advantage derived from the grid protector. The dealer taking me through this (last I suspect) significant upgrade cycle wanted me to try them and others who I know that use them are big fans. I think my dealer is excellent, and I hear a positive difference with these in my system
I'm a bit of a cynic about some of this-I couldn't hear a difference with audiophile switches for example, not to say that others don't-not for me to judge, but I hear a difference with these. If someone says its a placebo, well, I'd say maybe so, that's a real thing, No reason to be dogmatic. I just know my experience.
Most improvements I've made produce incremental, not night and day gains to my ears. The exceptions are moving up in speakers-always rendered substantial gains-mechanical devices with moving parts. The other is room treatments which change the way actual sound waves interact with physical structures. For me-only speaking for me-improving electronics produces positive results but not on the same scale. We all hear differently.