It comes perfectly packaged, neatly containing everything you need.
The only downside would be the proprietary charger, which requires you to keep it safe.
As a personal anecdote, I want to highlight that it saved my life on a trip. I used it to avoid losing my passport.
After going through airport security, where I had to quickly unpack everything and put it back in my backpack, there came a time when, near the plane, I couldn't find my passport. I was a second away from running to the security checkpoint, until it occurred to me to make it ring. I waited a few seconds, and when I heard it ring inside my backpack, I completely relaxed, knowing it was hidden deep inside.
Now I have one in my wallet every day, and another card with important documents.
Other interesting places to use it, considering its shape:
Kindle
Planner
Laptop