I was waiting to see if someone with more first hand knowledge could answer...
From what I've read people are generally very happy with the quality of the M-Edge covers. I loved the pre-eLuminator light M-Edge cover and passed mine on to my mother who loves it. I then bought the version that holds the e-Luminator light for myself. The cover was well again well-made but unfortunately the light was not. They have since pulled the light and are in the process of re-designing. I don't the bulk of the wider spine (designed to accommodate the light), so I've gone back to my original cover until a better light comes out (hopefully soon). M-Edge customer service is outstanding
..Even though I bought from Amazon, M-Edge went above and beyond to keep me happy. As soon as they release the new light, I won't hesitate in purchasing another cover/light from them.
From what I have read, the Mivisu covers are ok but do not have the same level of quality (and I know nothing of their customer service). Here is a link I found where quality of Mivisu covers are discussed (although not the same style you are looking at)
Hope this helps.