iCloud Photos - what do you think?

It's here! Finally. I've been looking for a solid photo back-up/sync service for a while, tossing it up between Google Drive and Flickr. This could be the winner for me. I think they should've made 20GB the free tier (if anyone doesn't need an extra $0.99/month it's Apple) and wish they were bringing the Mac app out sooner. Still, $3.99/month for 200GB looks good, basically matching Google's $1.99/month for 100GB. Who'll be getting it? Which tier?