"The E.F.S.F. is not enough," said Christoph Rieger, head of interest rate strategy at Commerzbank.
"It feels like continued liquidation," Brian Edmonds, head of interest rates at Cantor Fitzgerald in New York, said.
David Keeble, global head of interest rates at Credit Agricole in New York, said: "He took out the bazooka.
Christoph Rieger, head of interest rate strategy at Commerzbank in Frankfurt, said, "Someone needs to give in".
"It's not the negative yield that attracted investors," said Michael Pond, co-head of interest rates strategy at Barclays Capital.
"Treasuries at these low yields are not great trades," said Brian Edmonds, head of interest rates at Cantor Fitzgerald.
"It's too early to be confident that the recovery will weather any withdrawal of stimulus," said Dominic Konstam, the head of interest rate research at Deutsche Bank.
"It's not a game changer, just a game extender," said Jim Caron, the global head of interest rate strategy at Morgan Stanley.
Jack DiMaio, another Credit Suisse alum, joined in 2009 to be the global head of interest rate, credit and currency trading and stepped down in January.
Mark Schofield, head of interest rate strategy at Citi comments: "It is not just the ratings agencies who will be scrutinising policy measures going forwards.
