I just brought 2 pairs of these, one pair for each car and they seem pretty good.
For larger four door cars, the blind works by clipping over the top of the window, this might cause an issue with the window closing on some cars, on our Corolla, the effect was minimal. The blind then pulls open and stays open, it is attached to the bottom of the window by either a suction cup or by sticking a piece of velcro (supplied) to the door. I suspect most will use the suction cup option but it is nice to have another option. On a car this size, the blind does not fill the window so you have to decide on the optimal position for it to protect your child from the sun.
Our other car is a Yaris and is only a two door so clipping to the top of the window is not an option, fortunately some suction cups are provided which clip into the hooks allowing the suction cups to attach the blind to the window. Size wise, these were about right, attaching the blinds at a slight angle allows them to cover more of the window than hanging straight down. So far they have yet to fall off but I can imagine that being a problem as is oftem the case with suction cups. This method of fixing would also work on foor doors where the hooks are a little to big to allow the window to close sufficiently.
The blinds can be closed by pushing a little button on the side of the blind rather than by tugging on the blind so a small child pulling it will not cause it to roll up again.
Colour wise these are nearly black on the inside and a creamy colour on the outside. The black is fine but the cream does look a little aged.
For the price these are a nice pair of blinds that will fit most cars and do the job you expect and for this price, you can't expect a lot more.