There are a lot of factory frameworks, why one more? In my experience the otherones use fancy DSLs that were intended to increase readability but instead increased confusion. Workbench doesn't use a fancy DSL. It uses ruby. It doesn't use any fancy tricks like providing proxy objects for modification, workbench builders operate on the actual model. Since it uses very little tricks, it is also ORM agnostic. If your models respond to '.new' and you set attributes by calling #attribute=, then Workbench will work with your model. I have a hard time understanding why all the complexity around factory builders has grown, but often I look at the resulting DSL and say "That's more work than just defining a method and calling Model.new!"