Significantly Interferes with Touch ID
586111
The metal rim around the button sticker covers part of the button so when you try to enter a fingerprint it keeps saying over & over "Cover Home Button Completely" . I did finally manage to get a couple of fingerprints registered and it would work only about half the time, again because of the metal rim. Maybe if your fingers are really small & can fit in the middle it would work for you.
3218126
Very difficult to get on and off of your phone without scratching your phone!
4330234
I'm sure the case is very protective but it also makes your phone hard to use. The screen cover element means that your touchscreen will be VERY unresponsive to tapping and swiping. Unwilling to give up on the case so easily, I tried using it without the screen cover and just with the rubberised body cover, but without the screen cover my phone tumbled out of the rubber casing fairly easily. I've discarded this now and am in search of a better one. What a pain.
3670182
The screen shield interferes with touch system I live case but dissappointed I had to use film protector after I updated my iOS be careful
2753390
I can't say anything about the protective qualities of this product as I have not
dropped the phone (knock on wood).  But I had to remove the glass from the phone
because it interferes with the thumbprint ID system which sort of defeats the purpose
of that feature.
201754
Too thick, when you want to touch the screen, you have to keep pressing onto the screen in order to type something on a message etc
2474718
Interferes with Bluetooth connection to iPhone. Taking calls on Watch with this case on makes conversation impossible. Remove the case with all conditions the same, crystal clear reception.
470723
This product doesn't stay in place and cannot be used with password finger print
956137
Touch ID doesn't work well and all the buttons are covered. The case is pretty sturdy but it doesn't give enough access. I received this product at a discount in exchange for my honest review through Amazon Review Trader.
1079566
Very bulky. On an iPhone 6+, it makes the phone unusable. The front screen protector also reduces the touch sensitivity so you have to learn to touch 'harder'.
1441246
Messes with the touch screen. I had to tap multiple times to get screen to respond after installing.
1717941
While the device is functional and the battery does last long, the ZAGG Slim Book Ultrathin Case for the iPad pro is very heavy, and covers the ipad back and edges completely, making access to buttons difficult. The ipad frequently pops out of the holder, which is very annoying. Because of the pop out problem the ipad has hit the floor several times and the plastic case is cracked and broken off in several places. Regret this purchase.
1866920
In order to remove the back in order to insert SD & SIM card, you are almost afraid to open it. The instruction manual doesn't provide a "Privacy Protection Password" so if and when you do a  factory reset,you are screwed and unable to get back into the "phablet" to see if all your info has been removed (scary considering so much Identity theft). The item appeared to be delayed, like it had to think about what app you touched. It was the worst purchase ever.
2811344
This item makes it really convenient to secure your phone in the car.  However, the magnet seems to have interfered with my iPhone 6's performance.  In fact, I had to change my phone twice since sticking a magnet into my phone's casing.  After I started using the magnet, within one year of the phone's purchase, the touch-screen became unresponsive to swipes and taps.  I switched to a second phone (still with the magnet on), the headphone jack started having static noises within a few months.  Now I'm on my third phone (still with the magnet), and from time to time, incoming audio is mute during phone calls.  I eventually decided to remove the magnet, and since then, this mute-audio problem only happened once within a month (perhaps an after effect of using the magnet).  Therefore, unfortunately this device has caused more pain than convenience for me.
4529703
The screen does a terrible job with recognizing the touch of the finger. Seems like every privacy screen I buy has issues registering my finger touch. You also can not see ANYTHING when it's sunny so forget about using it if there is ANY sun.
2479197
The plastic covering the home button makes it very difficult for me to sign in using my fingerprint. The case also casues glare on the screen which makes it difficult to see especially outside.
4796608
As soon as I plugged these headphones into my iPhone 6, they started triggering Siri. This is a serious defect, because it makes it impossible to listen to music (or do much of anything else with the phone, honestly.)

I checked reviews on Amazon, and it looks like my problem is not unique. Several other reviewers reported having issues with this unit causing Siri to continuously open. It appears that this may have started when iOS 7 dropped, based on what other reviewers have noted.

If you are not planning to use these with an iPhone, you may have better luck. The unit I received came with a carrying case and several different sizes of ear buds, which should accommodate many different ear shape/sizes.  The remote seemed kind of flimsy, but you get what you pay for.