I suppose I have had the opposite experience with Windows Backup. It has always been reliable for me, if you follow some specific rules. It is not flexible like Acronis is, but the re-imaged system will have the exact configuration as the original image. It will not allow you to do things like replace the original drives with smaller drives, if the total partitioned space is larger than the new install.
I have not done a RAID re-image since I do not run one, but normal re-imaging works fine. I am fairly sure Microsoft knows how to handle RAID setups and would not give you a system that could not complete the task.
You have the option of installing your RAID, without entering a key, and then go through the scenario to test...