[One (M7) Accessories] cassull:
I recently received my black Devilcase aluminium bumper case today in the mail off Amazon and took some pictures. I haven't had it nearly long enough to comment on its performance, but I'd say so far that it's pretty damn good. I've taken pictures of the bumper on my black HTC One and my friend's silver One as well.

Below is the packaging. Came with the bumpers screwed together with two screws, a small screwdriver and a spare screw. The spare screw was a nice thought as I almost immediately lost one of the screws on my carpeted floor. The bumpers are definitely not going to fall apart, though since it covers the SIM slot, if you're ever out and you need to get the SIM out, you're out of luck unless you plan on carrying very small screwdrivers and a paperclip to eject the SIM slot.

Bumpers: Both bumpers are lined with a soft rubbery material. The volume rocker cover is actually quite nice and I think it makes it easier to adjust the volume with the bumpers than when the phone was naked since the rocker is raised. There is a gap between the power button and headphone jack since the back is rounded, which I've included below.

After installation: The bumpers are slightly higher on the corners, which I feel improves your grip on the One. My black One also has a fullbody Skinomi protector, though I cut off the sides on the back protector

Volume rocker:

On the silver One:

Gap: There is a gap on the power button and headphone jack since the One has a curved back. Not a big deal at all since the bumpers have to be straight. Is also a good indicator of how much space is placed between the phone and the edge of the bumper if you were to place it flat against a surface.

As for the back of the phone... I would recommend a protector on the back. The bumper raises the phone slightly off a table surface, but if you were to slide the phone around or if there was any dirt or grit on the table, I'm not the bumper would keep the phone away from that... I suppose it's a personal choice, but I like the extra peace of mind. In regards to the front of the phone, you can clearly see the bumper around it, but again, I would recommend a screen protector. I found Skinomi's full body protector to be affordable ($15 on amazon) and easy to install (would also recommend cutting off the edges on the back that are supposed to fold over onto the sides with scissors or x-acto knife and ruler before installing... the edges really don't stick very well and you won't need them if you're using the Devilcase).

The gaps on the power button and headphone jack don't bother me and I think it even helps me find the power button since it's so flat. I forgot to include a picture, but there is a hole for the microphone, so the bumper does not cover it.

In conclusion, I'm so far very satisfied with the Devilcase. I think it's a great case and would go very well with a back and front screen protector. To be fair, I have no idea how well it'd hold up compared to a beast of a case like an OtterBox, but I believe the OtterBox is probably considerably larger (and not as good-looking) as the Devilcase and I think that's just comparing apples and oranges... both are different types of cases and fulfill different needs. For myself, I'm just looking for a case that won't substantially increase the size of the One and can still over some to good protection against minor drops and scratches and slim cases like the Nillkin are what I usually gravitate to, but the Nillkin does not cover ALL sides of the One, such as the top, bottom and volume rocker, and dirt can get in-between the case and phone. Personally, I think the Devilcase is sturdy, great looking, improves my grip on the phone as well as the buttons, so I'd call this a keeper :)