I'll add my 2 cents since I used DIT and was happy with my results. I used bootleg copies of the 2012 DIT edition along with FA 2012. My study time frame was about 8.5 weeks.
I actually went through DIT twice (back to back) for my first and second pass. It was very helpful during the first pass, but I was very diligent about making sure I learned and assimilated all the info. On my first pass, I only did 6 videos per day (at this time the entire program was like ~150 videos at 40-45 minute each) so it took me about 3.5 weeks to get through it. I was also studying ~9 hours per day for this time period. There was LOTS of pausing, repeating, re-reading, and annotating. I tried to do some Uworld questions on random/ tutor mode on the side during this time frame but it was very demoralizing at the start because I was just getting most questions wrong and hadn't done enough review to get much out of Uworld. About 60% through my first pass of DIT I took an NBME exam that my school gave and got a 195. I was not happy, but I did not abandon DIT. Had I NOT used DIT for the 2 weeks to this point, I can almost assuredly tell you I would have failed. I definitely was learning, it was just that my baseline was a lot lower than I had expected. Anyways, I continued on my merry way and after completing DIT I was getting ~50-55% of questions right on Uworld (improvement from the 30-35% I started at).
I then went through all of DIT a second time except I did 7-8 videos per day plus a full Uworld question block on random/tutor mode every day (w/ the exception of Friday when I just took my nights off). By this point, all my annotating was done, I had been oriented to first aid, and I had been oriented to DIT so when they would speak it was just repetition. Obviously, I could get through the videos with less pausing and repeating. For the Uworld questions on tutor mode, READ every explanation in entirety even for the questions you get right. I read why the right answers were right and why the wrong answers were wrong, no matter how I did on the question. If you don't do this, you're not getting what you're supposed to out of Uworld. I only got through 70-75% of Uworld questions and know somebody who did 100% of the questions twice without reading all the explanations (suffice it to say, my score was substantially higher than his). During this time, I listened to the Goljan audio lectures as I drove between study locations and while eating meals. These audio lectures were nice, but if you want to blast Taylor Swift in car, just do that. Don't burn yourself out. Goljan audio isn't ESSENTIAL but it is definitely helpful and I'm glad I listened to them. By the end of my second DIT pass I was getting around 65% of questions right on Uworld (but again, this fluctuated daily plus or minus 10%).
In the last 9 days or so I blasted through all of first aid one last time (no more DIT) and actually started to scale back on Uworld. I didn't even touch Uworld in my final 5 days because I didn't want my score to play games with my head. In my last few Uworld blocks, my score varied between 55% and 85% so I just had to stop because it was just making me nervous lol. The day before the test I went through some last minute minutia and called it a day after like 2-3 hours of poor quality studying at a local Panera. I then locked my First Aid in my locker at school and went home so I couldn't even be TEMPTED to look at it one last time. I ate some great food, played some video games, watched an interesting documentary on North Korea, and then went to sleep like a baby for 7-8 hours. I was not nervous at all. By this point, I knew I had done everything I could and no matter what happened, I wouldn't regret anything I did. I went in there the next day and took the test. The questions stems were longer than a lot of the one's in Uworld so I pretty much went down to the wire on each question block without time to go back and check my answers (so just know how to pace yourself).
I ended up with a score between 235 and 245 (in the event someone can ID me, I don't want to put the exact number). I'm indifferent about my score because the number doesn't mean as much to me as the fact I kept focused on what I needed to do to improve each day, and I rarely lost my nerve like a lot of my classmates did regularly. So to sum up: DIT, FA, and Uworld took me from a presumably failing score, to a 195 after 2 weeks prep, to a 235-245 after 8.5 weeks prep. The most I can say is "this is what I did and this is how it worked for me."