Not brave enough to waste time on it here with a big library. We gave up on iPhoto when Apple pulled the LAN sharing out a few versions back, not that it was ever great, but a handy feature nonetheless. And iPhoto has serious issues with large libraries and it's too brain-dead to make it convenient to support multiple libraries other than just the basic ability to create multiples and option-click to load a different one when launching the app. iPhoto has a habit of corrupting the library catalog and losing photos. I had let my primary photo library climb north of 1TB in size and my wife's wasn't too far behind.
I guess I appreciate the iCloud data sharing abilities and interoperability with various devices. But it's not the only solution people want. All the cloud stuff lately feels like one step forward and two steps back. Sometimes I just want to share a bunch of photos I take at one of our kids events over to my wife's computer. My choices are slow and inconvenient iCloud, or pull up her computer and sign in to copy a folder full of pics over the network so she can load them, or dump the pics to a flash drive and walk them over via old fashioned sneaker-net. But yeah, the real issue here is the poor handling of large libraries or attempting to catalog multiple libraries.
So the brief look I've had at the dev version of Photos recently shows some improvements over iPhoto. But it's not up to snuff with LightRoom or what we have with Aperture. I've got the family trained on LightRoom and that's probably where we'll stay for the time being.
