Would you consider the current DAT test style and content to be more similar to the Destroyer books or the 2009 DAT released exam? I actually feel like the questions in the Destroyer are more straight forward. Just wondering!
I'd agree that the format of the test is similar to that of the 2009 test. I didn't have many "all of the above" sort of questions on the actual DAT, but there were definitely a few.
But I certainly would NOT use the 2009 as your standard for how to study. It could be a good benchmark, but there are multiple documented mistakes in the 2009/2007 versions, and the test has definitely gotten more difficult since those tests were released. It's been 11 years, so that's what you would expect! I took a look at them when I was preparing last year, and they didn't help me much for my exam. But hey, if you need some more certainty that you are ready or need more preparation, give it a go! They're free after all.
I'd say take them only to make sure you are comfortable in the testing situation, if you need it. But know the questions will be more difficult on the exam for sure. Maybe not Destroyer level difficulty, but it will often utilize a similar level of critical thinking or reasoning that those questions have you use.