Me, I'm still bummed that you can't view the Photo Stream from iCloud.com site. I have no plans to use the iCloud Photo Library because I have 40+GB of photos on my iPhone alone (which is soon to grow since I have 128GB model now) and the free storage space is only 5GB.
iCloud Photo stream only still exists because iCloud Photo sharing is in beta. iCloud Photo stream is a user hostile disaster and Apple knows it.
-limits you to 1,000 photos which means you have no idea when the photo you care about will be deleted
-Photos can therefore be lost permanently if you don't download them to another device in time and lose the device you took them on
-deleting photos from a device does not delete them from photo stream, so they keep reappearing on other devices like zombies
-deleting from photo stream does not delete a photo that has already synced to devices, so again more zombie photos
-edited photos don't sync
-photos take up space on ALL your devices, if you have more photos than device space that device can't view all your photos
Compare that to a user friendly system
-take as many photos as you want, subject to a trivial fee (Apple buyers can afford it)
-photos are safe as soon as they make it to iCloud
-delete from one device it clearly warns you that it will delete from all devices. No zombies
-ditty for deleting from iCloud.com
-edits are viewable across devices
-ZERO local storage required to view ALL your photos. Local storage used to cache photos and thumbnails if available