On top of that, you can use the Propr as a stand for tablets and phones, making it easier to setup and read from. I had the chance to test one out over the past few days and have been incredibly impressed. The Propr attaches to your device via suction, so regardless of your device type, you're good to go. The same goes for most cases that I tested with as well, and the Propr would suction itself to every surface I tried to stick it on.
I also spent some time acting like an elementary/middle school student (which wasn't particularly a stretch) and using the Propr to spin my device around as fast as possible. While this obviously isn't the recommend usage, the device stayed completely stuck to the Propr without any slippage whatsover.
In short, if you're looking for a more comfortable, effective way to hold your tablet, or to stand it up, I recommend checking out the Propr. It's currently on Kickstarter for the next 10 days, and you can get your own 3D-printed version for $25. Post-Kickstarter production plans are on their way as well and will be available at proprthings.com