some people seem to believe that it is necessary. I am not in that camp.
there are many ways to spend your money. tinting the pano roof shouldn't be one of them.
Agreed re pts. above as not rally necessary - the only thing I considered (but holding off right now) was applying fully transparent STEK film as I have on my windshield - there are at least two reports I read on here of folks getting serious chips/cracks from road debris hitting the roof but in all likelihood a low probability occurrence. That and there is potentially some risk in respect adding thermal stress to the glass but another story!