Airdrop is EXTREMELY buggy in iOS 8. It doesn't really matter if your device you wish to airdrop to or from are iOS 8 or 7 I've found.. if one device is in iOS 8 you will have a very low chance that a device will show up at all. Works a BIT better if all devices are iOS 8, but seems to have to do with the different bluetooth chips used in the different devices. My iPhone 6 has no problem with my iPhone 5S for example, but is totally flaky with my 5th Gen iPod touches. And if those touches are in iOS 7 or 8 doesn't seem to matter much. It's still totally flakey. It's REALLY frustrating and I hope they fix this irritating bug which did not exist when all devices were in iOS 7.