Perfect, fast, simple and powerfull. With Rose::DB::Object::Loader you can use existing models without coding! Just set connection options for your existing DB - and that is all - You can use your Database as a Model. For more information take a look at "The loader" section in the Tutorial.
I have perfomed some tests Rose::DB::Object vs SQL Abstract(with DBIx::Simple). In real world tests the perfomance is identical to both or Rose is faster!