For me, Photostream is pretty much useless - updating my photos automatically is nice but not a massive feature and the inability to delete individual photos, share photostreams between users and keep it for more than 30 days means it's a very limited "product"
Personally, I've subscribed to Adobe Carousel as it does provide a lot more functionality:
1) I can share a carousel with my wife and daughter and they can add their photos to it so we have a single photo library
2) I can set up a second carousel and share selected photos with my dad and other family members
3) It automatically syncs on my devices and people who you share with
4) Storage is unlimited and all my photos are available in the cloud, not just the last 30 days worth
Of course, one major issue with Carousel is that the photo management on OS X is very limited, but I got around that by installing picasa on my mac and pointed it at the originals folder within the carousel library. I can then use that to manage albums, face recognition, etc while using Carousel as a sync and distribution engine
Personally, I've subscribed to Adobe Carousel as it does provide a lot more functionality:
1) I can share a carousel with my wife and daughter and they can add their photos to it so we have a single photo library
2) I can set up a second carousel and share selected photos with my dad and other family members
3) It automatically syncs on my devices and people who you share with
4) Storage is unlimited and all my photos are available in the cloud, not just the last 30 days worth
Of course, one major issue with Carousel is that the photo management on OS X is very limited, but I got around that by installing picasa on my mac and pointed it at the originals folder within the carousel library. I can then use that to manage albums, face recognition, etc while using Carousel as a sync and distribution engine