I am running beta 4 (14A298i) on a mid-2013 11" MacBook Air. It sometimes loses the WiFi connection, but reconnects automatically. I've noticed the laptop will restart itself with PowerNap turned on, and plugged into an external display and external drive. Turning off PowerNap seems to fix it. Everything works pretty well. Handoff is a little funky, but you'll probably not be running iOS 8.
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