I'm a bit surprised that in the various replies there wasn't more mention made about LRmobile, which is available as part of the LR subscription version (in fact LRmobile is free to all users, but the important syncing part is only available to LR subscribers). Although it's still very much a work in progress, I use it quite extensively (more than I originally anticipated). All pictures that I take on any of my iDevices are automatically added to a designated synced collection on that device as soon as I start the app. The app then syncs the new pictures to Adobe servers, and from there they will sync back down to LR on the desktop and LRm on any other iDevice that you have signed into. For all those images that I take/have taken with my DSLRs I have created a variety of collections which I then enable to sync. These are uploaded to the servers, and then automatically downloaded to my iDevices....so as well as pictures that I've taken with the iDevices, I've also got my best DSLR images on the device as well. LRmobile is also a powerful image editor as well, and of course all changes made to a synced image either on LR desktop or LR mobile will sync to all the other signed in devices. But as well as the above, all synced collections are also automatically available in any browser using LR WebView, and of course the URLs of these collections can be shared (from desktop or mobile), so friends/clients can view/review the images and (if they have an Adobe account) they can "like" and "comment" on them. Any such "likes/comments" will appear in LR desktop. You can now also edit images via LR WebView. It's starting to get pretty slick, and well worth looking into. There are still some frustrations (lack of local sync, lack of metadata entry such as keywords in LRmobile, smart collections cannot be synced), but for effortless syncing and sharing of pictures - including those taken on phone or tablet - it works well for me.
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