I recommend 3M.

Regarding smart tag issue, they can tint the top 7 inches with a different dark tint, then the rest with crystalline.

I tinted my roc with colorstable 35 all around with crystalline 50 in front, my 2 buddies did the same with their passat CC and Polos, my dad did his crystalline 50 all around.

All for damn good price.

Can PM me if u ts are interested then I can recommend my installer.

No regrets, in fact I'm now waiting for my Kia forte to be done. Stripping off my Ecotint which was too bright causing glare and poor vision...

yes crystalline heat rejection definitely better but only slight margin. it's still good. so with the black tint + good heat rejection, it was enough for me to choose CS35 over crystalline