With mercury layer you don't have to worry about incoming liquidity, the privacy is very high, it's like exchanging cash and the scalability is total, again like exchanging cash, in fact you exchange the private keys outside the chain.
On the other hand the cons is that I understand that it will be a federated system.
Sounds good, but does it works actually somewhere?
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Currently you have mercury wallet, they want to take this further and make it a protocol with interoperating clients.
Would be great to have competition to lightning. One will become the best or parallel