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I stayed away from iCloud Drive because there were compatibility issues I believe if you weren't on Yosemite. I'm on Yosemite now wondering if I should go ahead and enable it.
If you're on iOS 8 and Yosemite everywhere, then there's no disadvantage to moving to iCloud Drive.
 
If you're on iOS 8 and Yosemite everywhere, then there's no disadvantage to moving to iCloud Drive.
I'll go ahead and enable it after upgrading to 8.4 and report back if it indeed fixed the sync issues
 
I got a reply from Tapbots today. They said it could be because I'm not using iCloud Drive. Are you using iCloud Drive or just iCloud?

I stayed away from iCloud Drive because there were compatibility issues I believe if you weren't on Yosemite. I'm on Yosemite now wondering if I should go ahead and enable it.

I enabled iCloud Drive when it was first released
 
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