I went a few shops to survey and interested on one no brand with Nano Ceramic/ Sputtering, IR 98%, UV 100%, 7 years warranty for RM588. 
My concern is about visibility, reflection, distortion. I want to get the darkest possible without affecting my drive and view. 
I plan to get around 50% VLT for all front and back windows. What do you think? Anything else I have to know? Thanks in advance for your help. 

For old Proton BLM windows tinted degrade and see bubbles, considering change new tint.

How can we save the rear window demister, defogger when redo new tint? Changing new rear windows can guarantee demister, defogger works perfectly with old car?

Is rear window demister, defogger a must to have? How of we use it, only during rain?

Please advise or share any opinions. Thank you.