Same, I use it for the free auto-upload and terabyte of space. It works beautifully, unlike any other auto upload tool I've used, and the terabyte of space is fantastic. I've used the auto-upload to hide photos (crudely) from authoritarian governments and I can actually count on it to upload instantly.

If it goes away I don't know what I'll use. Google Photos hasn't worked well at all for me, and I haven't tried Onedrive because the interface is fairly clunky.