Depends on what you want out of the VS. I was like you before, thinking whether to fit one or not?
Well, I went ahead and the only good thing about them is I got a slightly better less flickering lights and a better sounding audio that all.....

If the car is fair new, you won't get the flickering problem. Older cars with older wiring are more prone to it.
As for the audio, after fitting the bass is more solid and tweeter also clearer, but there is one VS that is dedicated to audio set up and that is the Pivot Raizin Black. I have fitted the Pivot Raizin Blue that is attached to the battery. That time bought at RM150....

Grounding for older car will be good. Newer cars like no effect as the wires still new.....

But as long as my audio sounds better also good enough......

Nowadays not too sure, because those older days, cars comes with thicker grounding cable. Only nowadays, newer cars comes with thinner grounding cables. These should have been calculated by the Car manufacturer already.....

But as you say, grounding cable is cheap, save how much......only short wire from engine to car body......

3 sets installed......fuyooh!

I know that, been there. Bought Wira, must take with alloy rims, was charged RM1400. Then when collect car go tyre shop to upgrade, was offered RM400 only....