hi guys, checking in cause i'm thinking of replacing my tint.
just want to know what's the difference between using just a normal groupon tinting vs known brands?

my current tint was by advance auto guard if im not mistaken using advant cool(i forgot where i put the warranty card).

sample groupon deal
and then my FWS broke as it was hit by rock during my drive. now i replaced a new one but without tinting

also if i were to use lower percentage of tinting(surely not jpj compliant) what would the risk, to say, of the tint protection in long term and will it effect the glass?