Move 2008R2 VM to 2012

We have a SAN that hold all of the VMs for a 3 node 2008 R2 Hyper-V cluster. We are going to remove that SAN from the 2008 R2 cluster and attach to a new 2012 Hyper-V cluster.

I have been testing the import of the VMs into the 2012 Hyper-V.
If I use the wizard to attach the VMs seem to work fine, even if they have snapshots.
however if I User Import-VM I get this:
import-vm : Unable to import virtual machine due to configuration errors.  Please use Compare-VM to repair the virtual machine.

When I run compare-vm I get this:
Message                                                                             MessageId Source                                      
-------                                                                             --------- ------                                      
Virtual machine saved state file version is...                                          21016 Microsoft.HyperV.PowerShell.VMSnapshot      
Virtual machine saved state file version is...                                          21016 Microsoft.HyperV.PowerShell.VMSnapshot      
Virtual machine saved state file version is...                                          21016 Microsoft.HyperV.PowerShell.VMSnapshot      

I have about 150 VMs that need to get imported so I do not really want to do them using the wizard and I need to keep the snapshots.

Any ideas?