I just received mine.
Definitely a *very* Spigen product, consistent with their design philosophy.
Let's start with the con:
• Edges are rather sharp, it lacks that rounded edges. As a result, it feels like a fair bit of bulk is added.
And the pros:
• The TPU material is definitely the best out there; about 4-5x thicker on the back side than the average TPU cases, and about 2x thicker around the sides/bezel/lip.
• Fairly decent lay on the table on the front face, leaving an ample clearance between the screen and table surface if you're laying it screen facing down.
• Audio port and USB port have their own cut-outs, and they're nice and have ample enough opening for most (respective) accessories.
• Volume buttons and power buttons are covered, and they have a very satisfying tactile feel when pressed.
• Clear material, really shows the true colour of the M8's Gunmetal Grey. Some TPU cases cloudy clarity; but not the case with Spigen's. EDIT: Someone mentioned a tint of yellow of the rubber; I noticed it too; but I believe it heavily depends on the kind of light that hits the TPU material.
• Improves tact; texture on the TPU material adds grip.
Things to watch out for:
• As like most clear TPU, there might be discoloration overtime. We'll see how the Spigen's Ultra Fit Capsule fares in the long run.
• Spigen's other Ultra Fit products come with a screen protector. Wouldn't hurt for Spigen to bundle the Ultra Fit capsule with a screen protector.
Overall, I'm pretty happy with the purchase! Spigen never disappoints. But having said that, I wish they'd curve the edges slightly.
7.5/10 (that sharp edges really hurt the score).