Just keep in mind that it once you apply to AADSAS, it takes them 4-8 weeks to process your application and get it sent out to your designated schools. So if you submit you application today, it COULD be as late as mid-Novemebr before your schools get your application! And if that is the case, then all of the Sept. Oct. and November interview slots are filled... so you'll be competing with A LOT of other applicants for a spring interview spot. That is is advantage of applying early.
Now, keep in mind that you don't have to wait to apply until after you take the DAT! Have you written your personal statement yet? That is what really takes a long time.... as it is not something that you can rush.
As far as the comments from FutureDocBerg... and for the rest of the website.... Use this website as a resource.... it is not meant to scare you or discourage you. If you read the threads, look for the reoccuring themes (i.e. Destroyer rocks for Organic, and this year, the QR section is harder than h*ll) and go with that. You'll occasionally see a frusterated applicant venting (as is FutureDocBerg) and you just have to look past them. This website has helped a lot of people, and the majority of people are wiling to offere advice to others whether it is on the app process or just helping them solve a problem.
Good luck!🙂