We now have two sets of these on a daily basis. In direct comparison with much more expensive brighteners (eg Sunbounce) are it to the surface coating absolutely nothing to complain about. Of particular note, I find the fact that even a zebra-brightener included in the set (the name the "soft gold" have Their copywriters obviously have no idea what they sell there ...). Zebra brighteners costs with other manufacturers often a small fortune.
The brighteners can be folded and take quickly with a little practice then only a little space. Due to the almost ridiculous price and really good processing there is a strong buy recommendation from me!