Hi, just share my experience with raytech tint, tinted one month ago. Front windscreen using ultra 70, others centurion 6mil.
Tint workmanship overall is good, except passenger side window got one tiny bulge.
For performance, as this is my first tint, I have no other tint for comparison, but definitely I am feeling the different between tinted and non-tinted.
For GPS and my condo remote car entry key card, there is no issue with it.
However there is issue with my Smart tag. Most of the time I have to literally stop the car at the smart tag lane for one or two second for it to detect, where by before tint only simply drive through. If I drive slowly without stopping, quite a number of time it cannot detect. On some occasion (not often) it cannot detect at all even car stopped for like 5 second, I have to wind my window down and take the smart tag out then only can detect.
For your info, I am using the latest edition of smart tag (bought one month ago).
Any tips to improve my smart tag?