nHibernate Database Benefits and Costs?

Object Relational Mapping, SQL Server
I posted this question over at SQL Server Central, just like my last post, I'm also posting it here. I need some help. I've been trying to research this and I can't find good, hard facts. Any help would be deeply appreciated. It looks like we might be facing a large project shifting over to using ORM methods through nHibernate. I'm trying to get a read from the database community on what exactly I should expect in terms of issues, challenges and headaches during the development process. I'm also interested in any long term maintenance issues, troubleshooting problems, etc. If your developers implemented ORM all the way down to storing object data on the database in a non-normalized/object oriented fashion, how did that affect you? Did it muck up reporting?…
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