All I will ever say about the Kindle. HOW THE FUCK DO YOU MAKE A FUCKING BOOK REPLACEMENT DEVICE THAT IS NOT THE SAME GOD DAMNED SIZE AS A STANDARD PAPERBACK BOOK. We got my mom a Kindle so she can read her murder mysteries. I want to like the thing, but seriously, why is the screen not the same size as the print in a standard paperback? My Nexus7 would be a perfect ereader if it had a better screen. And at this point, since the stuff I read is the same cost for digital or physical, I'll stick to the physical.
So thing 1: The advantage Kindles have over your Nexus 7 is that eInk is a reflective display, while everybody's xPad is a transmissive display. Reflective displays cause substantially less eyestrain and they also don't trigger your visual cortex into thinking it's daytime and interfering with your melatonin cycle. In other words, you can read a Kindle for longer and you can read them before bed (or a nap) without them keeping you awake. Thing 2, though, is yeah. The form factor of kindles are shit. I have a DX, which is about the size of a legit iPad, and the printed area is about the same size as a trade paperback. It's pretty much perfect for paperback stuff. And back when they were selling them, they were selling them for like $400, and that's why Kindles are tiny and shitty: the eInk display ends up costing as much or more as an LCD. There's a million and one things wrong with Kindles, but Thing 1 is such a big deal I don't care. Especially since I've got a DX.