Eaton Vance Corp. garnered much attention last year when it won approval from regulators for its exchange-traded managed funds, or NextShares.

Now as Eaton Vance gets set to launch these funds, Moody's is out with a bullish report on the product. The firm says the structure of these funds will help active managers regain competitiveness over passive managers by reducing the cost and tax inefficiencies of mutual funds. But obstacles still need to be overcome for wide adoption.