I'm not sure if you're trying to imply that Lightning Network is vaporware, but there are currently three implementations that pass the integration tests:

https://github.com/lightningnetwork/lnd https://github.com/ElementsProject/lightning https://github.com/ACINQ/eclair https://cdecker.github.io/lightning-integration/

Oh, please. You and the other replier knew what I meant by "implemented."

"Code written and passing integration tests" seems like a pretty typical definition to me..?

By that definition I've implemented a search engine, several video games and many other projects that never launched.

Lightning Network has not launched, in the sense of, it is not being used by the community it was designed for. And it never will.

Not vaporware but vaporidea. They never solved incentive model to open channel so it is more like real software no one will touch.

What's the problem with the channel-opening incentives? I'm out of that loop, I'm afraid.

Special for you https://medium.com/@homakov/why-lightning-and-raiden-network...

Ah, thanks Egor, I hadn't seen that.

Not only has the Lightning Network been implemented across three codebases, version 1 release candidate was released a week and a half ago:

https://medium.com/@lightning_network/lightning-protocol-1-0...

Doesn't Litecoin already use Lightning Network?

Doesn't solve usability, but it solves the slow transaction speeds.

Note: transaction speed is a component of usability

That's possible, but the commenter above you isn't talking about that. He is talking about the fact that it is yet to launch and solve all of the problems it purports to.