Yi,
I really love the Mobi case. The reason I like it is because I don't have to buy a screen protector for the iPhone. The flip up hard screen protector that connects to this case is wonderful. I bought the smoke colored one, but have just ordered a clear one as well, because I really like the look of the iPhone (the darker cases seem to cover up the iPhone, and I feel the clear one will show it off more.
I bought a cheap ($5) horizontal holster made for the Treo, on the street in NYC, and the Mobi case fits in it perfectly, even though the Mobi has the piece on the back for the optional clip (I think it can come off, but Im not sure how to do it). The horizontal holster has a clip for the belt, as well as belt loops (which I prefer). Unfortunately, I bought the Krusell horizontal holster, and though it is awesome, quite nice looking, also with a clip AND belt loops, but the iPhone in it's Mobi case won't fit in it. The Krusell is really a nice case if you want to carry your iPhone naked in a horizontal holster.
Overall, I actually like the Mobi case more than I expected, especially for the price. I've had Mobi products for my last phone, a Palm Treo 700P, and their products were quite good.
That being said, The Scosche case looks very nice, very classy (though I LOVE the flip up hard screen protector on my Mobi case !). I will report on the Mobi Case when I get it (the clear version).
Also, I don't work for this website, and have ordered many many things from Amazon (too many items to count), but the Everything iPhone store was perfect as far as delivery of my case. I ordered it, it told me what date it would get here, and on that date, there it was sitting on my doorstep. As far as I'm concerned, they are batting 1.000. It could be that I live in NY, and I believe the owner of this site lives in NY too, but they were perfect as far as delivery service. A wonderful first experience.
Happy hunting and best of luck in your search for a case.