The biggest problem with the current beta is the lack of integration with iphoto. If you turn iCloud Photo Library on my ios 8 device it will ONLY upload and sync photos taken via an iOS device. It will NOT see or sync the photo stream on OS x and those pictures will drop of the iOS device. I know this will change with the new photos app next year but it makes it kind of unusable now. I take 90% of my pictures with a DSLR and import to iphoto. I take very few via ios.