Not too much to write about this to be honest: it's just a case! But I'll do my best to make it comprehensive.
Starting with the inside - there's two compartments separated with a simple fuzzy flap. One is big and you put the 3DS in it, the other is just for two styluses (styli?) and three games, with what looks like space for three more on the flap itself, making a total of six.
As described, the case seems sturdy and will likely do its job just fine. I have had official Nintendo cases for well over 10 years - basically one for every console since the Game Boy Color - and they have all been perfect in keeping the consoles safe from bumps and scuffles with nature.
So why four stars? It's simple. The design on the outside - yes, the one you see in the picture - is not, as it seems, a nice smooth plastic image. All the lines you see are actually indents in a ~5mm plastic block that is attached to the case - they look like tram lines in a road. I do not like the design as much as I did looking at the picture.
However, it's a case, not a catwalk model. I'll use it, and I'll probably grow to love it. It'll do the job, and as I got it with my 3DS for a fiver, I still consider it a great bargain.