I was very skeptical because some buyers complained the difficult assembly of the cover. I can not confirm that, however. I found it very easy to attach the cover. A little tip: The headrest must be fully extended, then you get the hook and loop fasteners to fine. when the bottom cover is then secured, one can relate the head restraint to the upper reference and adjust it back to the level that is just suitable for the child. So really quite simple.
The material is my feeling feels after very pleasant. The only downside is that the cover is bright white. The personally I do not like, because the great real color of the seat disappears under it. But well, this is only an optical defect.
The use in really hot weather is still pending. Then we will see to what extent the relation holds technically, what it promises.