I too was looking at this recently.
Imho, this magnetic sunshades have it pro&con.
The main purpose is to block the stronge sunray from shining through the window(for course).
So use it for privacy purpose as over-tinted solar flim is not approved so this is the alternative to do so.
In the past, there is this brand Groovy which customise sunshade. Groovy was using clips to hold the shades thou, which I find it better as compare to the magnetic ones nowadays(depend).
As clips never failed to hold the shades in place, just that when you need to take it out and place back abit mafan unlike those magnetic shades.
And read reviews saying the magnetic effect may be weaken after a period(for some brands, well it is magnets) which cause the shades to be dropping(even when you open or close the door) and this defeat the purpose for putting it.
Well for this issues, there is always 2 school of thoughts:
Some bought the expensive ones(which easily cost $200+ per set) which the magnets should last as advertise/market.
So far lot of good reviews.
Some bought the cheaper ones(which may cost less than an hundred per set) which magnets may or may not be lasting but if magnets weaken, they can always buy another set which sum up to be cheaper than the expensive ones.
So it is up to you.
I never did a comparsion on the quality of the sunshades itself, but the expensive brand will stated that it uses better quality for the shades, hence it better(for eg thicker) go check it out of free and see if it better?
Otherwise both works well when you need to take it out and put it back, etc etc.
Eeerrr it just a magnetic sunshade, easlier than PSLE ba lolol
PS, if travel at high speed and you accidentally open your window, the shade will fly off and away wor.
So see which fit your bill and go for it if you want.