I choose Juggernaut because left to mine own devices I usually gravitate towards sets of 3-5 reps on all big movements. I thought the Juggernaut system with the 10,8,5,3 would change things up for me with the 10's and 8's. I had never heard of the system until browsing the threads a couple months ago, bought the E-book, and found the Excel sheet with the equations on line for free. Not that Chad Wesley Smith will read my log but I would include the Excel sheet with the E-book upon purchase which would have saved me the hassle.
So far the 10's wave has been a piece of cake but that might be by design. I am sure that by saying that I am going to pull foot from mouth in the 5 and 3 wave as it ramps up to higher intensity. Also, since I was able to get any where from 12-19 reps in my AMAP sets my weights for the 8 wave have already adjusted to become much higher.
As for the volume comment, I am in and out of the gym in 60 minutes or less which is the usual gauge I use for volume. I had thought about treating my reps on every lift like the waves and decrease them as the wave decreases. What I mean by this is that I now do 12-8 reps for all assistant work but as I drop to the 8's wave maybe I will drop to 10-6 and so on.