Since the original Samsung s flip cover is £45, this appeared to be a very good value. The package arrived in a few days. The quality is fairly good, and it does allow the 'S Flip' screen to operate, so you needn't open the cover to take calls.
However, ffter using the cover for week, I took it off and now just have the S4 without a cover. Its much easier to take photos and access the camera without the cover on. Its not an iPhone, and it doesn't smash if you drop it. I don't think a cover is essential with the S4. All in all though, very pleased with the cover I received, and for the week I used it it worked very well.