i just took the DAT last week. I took the 2009 1 week before the real DAT. I also took the 2007 DAT and the practice OAT on the ADA website 2 weeks before my DAT. The 2007 DAT, 2009 DAT and the OAT are the most similar you will get to the real DAT...
2007 DAT is easier across the board..but the questions are very similar..just more complex on the real DAT
2009..sciences are very similar to the real DAT..chems are slightly easier on the 2009 (depends on you)..Bio is equal..
2009 PAT is easier compared to the real DAT..use bootcamp for PAT practice!
2009 QR is pretty weird ...but so is the real DAT..it is an underrated section in terms of difficulty IMO..I would say 2009 and real DAT are equal in difficulty
RC is the same for me..scored 21 on both the 2009 and the real..my reading scores are so random though..some I will get a 18..next test ill get a 22...so idk lol
overall, 2009 is slightly easier in Chem, Orgo and PAT..everything else is exactly the same...it is the BEST judge of how you will do...your 2009 is the best predictor...treat it like the real thing..and only take the DAT if you meet your goal on the 2009..