The "efficiency" of Evolution remains to be seen as not enough details have been released to evaluate it.
True.
Evolution is also advertised to be able to handle millions of tx per second outpacing traditional FIAT systems, which would indisputably tower over any currency system in efficiency. Since anyone can claim this kind of thing it would be easy to yell "vaporware". Thing is: We're talking about Evan Duffield here, not some, say, random Hashfast scammer with non-existent ASICs.
Let's check his track record, shall we:
Announced DarkSend - Delivered DarkSend
Announced opensourcing DarkSend - opensourced DarkSend
Announced Masternode functionality - delivered Masternode functionality
Announced instantly confirmed transactions - delivered InstantX
Announced Decentralized Governance by blockchain - Delivered DGBB
I'd say tirelessly working on this project qualifies as a pretty damn good indicator that the promised features will also be delivered.