Well, as you may know it's currently being used in some coins like bitshares [0] and it works fine, Ethereum also is migrating to PoS [1]. So the consensus for a lot of people in the ecosystem is that it works.

[0] https://bitshares.org/technology/delegated-proof-of-stake-co...

[1] https://www.coindesk.com/ethereum-casper-proof-stake-rewrite...