1. The alumina bumper case is a beautiful crafted aluminium bumper style cover. The workmanship is top notch and had full cut out for both charging port and usb. It came with minimal instruction and all in Japanese. So far i have no problem with the signal issue with wifi and cellular. It is my first ever metal bumper case so i can not compare to other brand out there but i am very please with the purchase. However due to its design, The bottom part of the phone is slightly more bulky compare to the top it might take some time to use to. and some edges are quite sharp (the top corners), gave abit of uncomfortable feeling while holding for a long period of time. The buttons are very tactile and easy to press especially the power and camera buttons are so much easy to use now. The volume keys might need some more force to press due to sony design (slightly raised for both end). So far it is a great product from alumina.
2. I was set my eyes on the alumina, until i came across this product from hacoa with their wooden product for gadgets and appliances. It looks very nice and solid in the hands. i can feel the wood grains and warm feel everytime i hold the phone. no problem for signal or functionality of the phone so far, however it is quite expensive for a snap in case. But considering the materiel and build quality, i would say i can justify the price.
Enough with mumble jumble words, here are some shots that i took with my ip4 (yes i know it is crap but cant access the z1c due to updating the firmware at this time).
That is all for now folks, have a good day.