I just bought this case and find it the most attractive, stylish and best made case I have ever used on my S4. For me, It totally transforms an ok looking plastic phone to one that goes beyond an HTC One or iPhone. I have always liked the unconventional designs of designer cell phones and this case makes a conventional and somewhat boring phone far out. The fit and finish of the aluminum is incredible. It is very solid with no flex or creaking. The feeling of it in the hand is luxurious. This is what I expect from a $100 case.
I recently bought an Element Eclipse S4 but was not totally happy with it. The Eclipse case is pretty nice but the TPU/plastic lower case and the aluminum bezel do not line up flush with each other. I would expect it to be near perfect on an $80 case.
I have used a number of TPU and plastic cases. that take away from the look of the phone. To me, the phone looks better naked instead of in a plastic case, but I wasn't going to use it without one.
I have noticed some signal loss, but it has 4G where I really need it so its been ok so far.
There are some other impressive aluminum cases, like the ones at casefanatic, but I'll probably use this one for a long while.
So that's my mini review and thoughts on this case. I hope it helps anyone interested in buying one.