No. They're going to wait for 120 blocks.
See, the problem with PoS and this is that you're getting coins without doing any work; how is this supposed to give it value?
In PoS you need to have investment instead of work, but --
It encourages holding the coins as investment, avoiding it's circulation, i.e. true use as a cryptocurrency. Then worst -- PoS looks at the coin age; the longer you're holding a large amount of cryptocurrency, the higher the chance of mining a block, which further reduces chance of circulation. However if the profits proof of stake is giving you is negligible, then we may nullify this disadvantage.
This coin encourages spending, but this'll always result in false transactions.
I'm not sure about attacks though.