For starters, I've learned that Airdrop is wifi only. I'm sure for reasons I don't fully understand, but frustrating if you have 30 gb of files to move and you want a more reliable connection. I suppose it's in the name, but still. Also when moving these large files, it will just stop maybe half way through, with a dialogue saying receiving Mac canceled. I'm using caffeine, so nothing goes to sleep. I remember in the past the receiving machine had to a approve the transfer, maybe that was mavericks, that doesn't seem to be the case this time. What the heck is going on? How can I reliably transfer files?