The bumper is very stable and sits tightly on the iPhone 6s. It was quite easy to attach the back and screen protectors without bubbles. The front protector, however, is only 1mm wider than the screen. So you should light up the screen before attaching the screen protector. With a sharp knife and a bit of flair, you can gently raise the protector from the screen again and correct its position, as it only adheres and does not stick to the glas. All buttons can be operated as usual. The cameras, microphone and the speaker work flawlessly. The latter even sounds a little bit better than without the bumper. The iPhone is a LOT easier to handle with the bumper and not slippery anymore. The 3D touch function of the iPhone 6s is not affected at all by the screen protector. Using this function, you can open the app list by pressing the left edge of the screen firmly. That's exactly where the sharp edge of the screen protector now sits - which is somewhat uncomfortable. Stock phone jacks do not fit into the speaker socket anymore; the original apple head set jack does fit, though. IMHO, considering the price of this bundle, Evolutive Labs should spend an adapter upon request so that one can connect the iPhone to other devices that do not support Bluetooth. I cannot give any statement regarding the protective qualities of the bumper since I haven't dropped my iPhone yet. I had chosen this bumper because it had several spectacularly good reviews on YouTube. At least I can say that the screen protector did not suffer a single micro scratch after several weeks of use (unlike the original iPhone screen after just a few days). The original glas of the iPhone 6s is VERY oleophobic, unlike the screen protector from this bundle, unfortunately. By now, other screen protectors are available for the same money that are oleophobic and that even offer additional buttons next to the home button. Most of them should be compatible with this bumper as it leaves most parts of the front side uncovered. All in all, I am pretty satisfied with this solution. I also purchased a belt pouch made of genuine leather from Matador. The size for a "Sony XPeria Z3" is perfect for this bumper (http://www.amazon.de/gp/product/B0176DDRGM). P.S.: I just noticed that this forms purpose is to enter a review for the vendor, not the product. So I've had a query regarding resellers on Amazon and Ebay and questions regarding the product prior to my purchase. Evolutive Labs responded immediately, competently and kindly. So that's a clear 'A' mark, too.