It does work with all of them, Ive troubleshooted with many many many people and the ones that didnt work ended up being user error at one point or another. Another thing is sometimes after "enable handoff" shows under general you either have to wait for devices to "handshake" or you can sign out of iCloud and reboot a bunch of times to force the "handshake".
Airdrop also works fine with the 2011Mba as well but you either need to make your computer a contact or on the computer change "Allow me to be discovered by" to everyone.
People seem to have a misconception about how handoff/airdrop/continuity works. This isn't a "hack" its simply erasing apples code that says "do not allow these machines to use handoff" nothing more.
I think the "IT" in my sentence is different than the "it" in yours, you're talking about the "patch" (while I'm talking about continuity). Right?
Gary