If you are looking for a camera that is more convenient than a DSLR but still great quality than apparently mirrorless cameras can be a great compromise (or not even a compromise? See comment below). A couple of friends of mine have this camera and they love it - it also has more flexibility with the lens that it can use.
$600 seems like an amazing price. It's the #1 pick for mid-range mirrorless at The Wirecutter.
Original 20% off 128 stores on eBay Deal Post
Edit: updated the wirecutter link.
I can definitely recommend this camera :)