Well, it was sketchy at best before and I initially couldn't get it to work, but after updating to 8.1 I see no Handoff icons on either rMBP or iPhone 6. I've done every fix I tried before, toggling hand off on both devices, restarting both, repairing permissions, reseting networking settings, signing out of iCloud on both devices, turning messages on/off, turning FaceTime on/off. Also, as I presume it sees it the same way, no instant hotspots appearing in wifi. Coupled with multiple other bugs i've got with Yosemite (like notification centre settings resetting every time I reboot) I think this is some of the worst functional software work Apple has done, the last 2 months have been an utter nightmare of things that don't work. I was going to updated my Handoff bug thread which shows how when you edit a file in Pages or Numbers and then click handoff on another device before its saved and synced he changes it takes MINUTES to transfer it over and open, rendering the feature useless....but now I can't even get the damn icons up anymore!! At least phones calls and SMS work ok, those features are much more important and usable I guess.