My only concern is leaving a package on the door stop all day. I live in a good neighborhood where I can leave my door unlocked without any worries - heck my stepson left the door literally wide open once (and nothing happened) and yet I'm not comfortable about pre-signing.
Ya my iPhone 6 shipped today, from China so won't be here until next Fri. Ordered through Apple and they wouldn't let me use my work address to ship to due to carrier restrictions, which is odd because ATT is my carrier and they do allow alternate addresses. Anyway I saw that presign button and almost did it, but read the fine print about by clicking this you agree that Apple or the carrier will no longer be responsible for any damage or theft, something like that and I'm like no way especially not after reading some of these carrier theft stories! Looks like I'll be taking next Friday off
ATT uses FedEx, not sure who you ordered from though. But, the FedEx guy told me ATT doesn't require signature. But I printed off the tracking page and wrote on it to leave at front door. I signed it too.