Hi!
I don’t know about the akai Eie interface. For recording vocals, I own the alesis io dock and that makes the job, , has 2 in and 2 out, midi in out too and some extra features.
I’ve heard about the Behringer istudio which seems very close to the alesis io dock.
EDIT: the alesis io dock isn’t working with the new lightening connector. You’ll have to use an adaptator