Cons. 1  Cannot span multiple databases... at least not easily. 2  All entities (tables, views, etc) need a primary key. 3  If you want to update a single column in a 100+ required columns table (not my table design), you have to pull down all 100 columns to make the update. Or use a Stored Procedure. I've had issues with some default values defined on SQL server not getting pulled into the entity model after a new record gets added. Usually this is with computed values, or values that get added in an INSERT Trigger On occasion, the SQL queries get badly written and are slow to execute.
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