My Johncase arrived this weekend and my Shumuri just came today. I've had the Spigen Air Skin for the past week and thought I'd post some comparisons.
The Shumuri (grey) is on the left, the Johncase (blue) is in the middle and the Spigen (greyer) is on the right.
The Spigen is definitely a darker grey than the Shumuri, or perhaps more opaque.
The cut-outs on the bottom for the headphone jack, lightning port, and the speakers are much cleaner on the Shumuri than the Johncase. In fact, the speaker grill isn't completely cut out on the Johncase - there's a thin plastic in one of the holes I will have to push out. The distance between the top of the case and the holes is also less on the Johncase. In the picture it looks like the Johncase is a bit crooked/bent. It is. That is how it arrived, though it probably won't affect how it goes on the phone.
The Spigen case is on top, then the Johncase, then the Shumuri. Again, the cutouts are cleaner on the Shumuri. The Spigen case has individual cut-outs for the volume buttons, while the Shumuri and Johncase don't. However, the buttons aren't centered well on the Spigen. The cut-outs are also slightly smaller on the Shumuri and Johncase than on the Spigen.
Same order. The cut-out for the sleep/wake button on the Shumuri and Johncase is slightly smaller than the Spigen. On the Johncase, it is also ever-so-slightly crooked
The camera cut-out for the Shumuri and Johncase is smaller than the Spigen.
Sadly, the cut-outs aren't lined up correctly on the Johncase. Practically unusable. Sorry for the blurriness - it was taken with the FaceTime camera on my MBP.
Unfortunately, the cut-outs are misaligned on the Shumuri as well - although not as bad as on the Johncase.
Overall, the cases are identical in feel/touch. Very similar to the polypropylene folders you can get at Target, though not as thick and a little more rigid. The Spigen seems to either be thicker or stronger than the Shumuri or Johncase. Particularly around the cut-outs, it doesn't bend quite as easily. I haven't experienced this with the Shumuri (yet), but the Spigen case does get the "shadows" of some light scratches. These "shadows" are similar to the ones I experienced on the old Incase Slider cases. Barely noticeable, but there when you look.
Because of the alignment issues, I'll be sticking with my Spigen case for now, as much as I loathe them for their terrible customer service.
Hope it helps!
UPDATE: I contacted Shumuri about the alignment issue on the case. They responded VERY promptly and were happy to replace the case. +1 for Shumuri!
