I just pulled the trigger on the full kit. I have a Sears Die Hard Platinum group 35 that I wanted to use for a dual battery system, so I will just use that for now. I watched all of the videos and read the discussions, as well as exchanged an email with Brett that answered any remaining questions.
For me, it came down to mobility, efficiency, and cost. I can use the unit in either of my trucks, I'll know exactly where the power level is and hopefully extend the life of the battery being used, and it's a great price point.
I'll report back when it arrives.