I use Entity Framework for C# and I have grown to appreciate it. I get libraries for in-memory databases which makes it easy to write thorough unit tests, the `Include` function uses join to include foreign key objects in an optimal manner, and scaffolding tools make it easy to map from SQL to C# classes. The resulting SQL from the Linq expressions is logged which makes it easy to see what is going on, if you already know SQL. The only problem is that I think the writeback to the database of manipulated or new objects is not clear but that might just be because I haven't read the documentation for that thoroughly.
EF is fantastic to use. I think it's because while other ORMs try to integrate their logic into a language, EF was developed alongside linq, IQueryable stuff and language extensions. Basically, they changed the language to better accomodate stuff like EF. And it shows.
