I strongly suspect these would be OK if properly applied and have been considering them as they are a low cost option. I may be too lazy to do this awkward job though.
There a very good fit and you would think the windows are tinted.
For us the window tints were around £150 plus an extra £100 per year for the insurance. With the blinds there was no extra for insurance, yes I would agree tints are slightly better.
I ordered mine from that website, best price I could find and I preferred the rear window as a whole piece instead of two separate pieces like most other blinds.