Our household has a HP 8" Android tablet (New purchase), which is used for a range of things from web browsing to videos and tv shows for my daughter, to a bit of gaming for my wife & I. And my wife has a Kobo Mini E-Reader which she uses obsessively, she has hundreds of books on there.
Our own personal library has close to 1000 books in it as well, I generally purchase a new book every fortnight, currently working my way through a bunch of Football (Soccer) History books. My wife used to get 15-20 books from the library a month, instead she now reads on her Kobo and can get new books without ever leaving the house.
I am tempted to get an E-Reader of my own, but still enjoy having an actual book, Book Depository being my main source of books as for some reason buying them in NZ is ridiculous, talking twice the price I can get them online. I used to shop at an actual book store which would order me any book I wanted and at a reasonable price, but they were a new chain created by an old chain, and when the old chain started to lose money and got bought out they closed the newer chain, and kept the "old name" for history purposes, even though the newer chain was making money, and the old brand losing it by the bucketload. As such I now almost never visit a store to buy books, and other than my local hardware store slowly going online to purchase everything else as well.
I also have a 5" Android Phone, which gets used almost as a tablet a lot of the time as well.