I bought one to use with my Samsung Galaxy Tab 3. It's a nice size (about two-thirds the size of a laptop's), the keys have a nice feel, and it's nicely made. One thing I really like about using an actual keyboard is having cursor arrow keys, which helps a lot when editing.
I sent one to my sister in Texas to use with her Kindle. She's absolutely delighted with it.
I use it with my phone once in awhile, too.
I'm glad I bought it.