http://www.reddit.com/r/iphone/comments/2ic5ub/has_anyone_with_a_128gb_iphone_6_been_able_to/
http://www.reddit.com/r/apple/comments/2ia9pt/iphoneipad_users_with_large_music_libraries_do/
I'm glad to find out these sync issues aren't just happening to me.
The greyed out songs with the dotted circles that won't sync, the whole stuck on Waiting for changes to be applied for hours, the corruption of music then listing it all in the other category rendering it inaccessible, the inability to add new music at all after the first couple sync sessions because all new songs get greyed out after that.
I know 18000 songs is a lot to put on this device but that's not even half my music collection I had to pick and choose what albums to put on there and I bought this 128GB for a reason. Its hard to believe I paid over $800 for this device and I can't even regularly sync or add music to it without it having serious issues.
This device came out months ago and its still this broken. I know it's not really the device it's iTunes. If they can't get it right with iTunes then they should just let us drag and drop music like on Android. This is the second time in the same day I've had to sync all 18,000 songs to this device. It has to sit there for hours doing this because the transfer rates in iTunes are so bad.