Bet on Sharepoint 2010 Workflows? [closed]

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I am looking into Sharepoint 2010 currently and it seems to me the workflow engine being used is based on WWF 3.5. I wonder if it's a good idea to do this as WWF has been gone through dramatic changes with version 4. I wonder if the investments would be save.

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WF in .NET 3.X and WF in .NET 4 are both powerful workflow platforms. The workflow platform in SharePoint 2007 was based on .NET 3.0 and hence bringing forth that support into SharePoint 2010 brings a proven workflow engine to excute SharePoint hosted workflows.

The timing of the release of .NET 4 simply didn't allow for it to be baked into SharePoint 2010.

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From Improvements in SharePoint 2010 dated Nov 2009:

It should be noted that SharePoint 2010 requires .NET Framework 3.5. The next version of the .NET Framework 4.0 is currently in development but product timelines meant SharePoint 2010 was not dependent on it.

Hence the workflows in SPS2010 are built on top of Windows Workflows for .NET 3.5 and not .NET 4.0.