If you are using the common beam and column structure and "filling in" with EVG panels you can definitely save money and time on labor. I stubbed rebar out of the columns and beams to tie the panels to. I also used additional rebar on the panels where they join (not needed from what I've read, just tied together) as well as around window and door openings. The savings is not just in the panel install but utility rough in as well.
For the electrical I was using rigid PVC at first which, though faster that dealing with block, still took a bit longer than it should have. I ended up taking a torch and melting the styro and then running the flexible PVC in the walls. Even as thin walled as it is, it takes PVC couplings and glue so everything in the slab was rigid and then transition to the flex in the walls.
We have some plans starting next year and we will be using the EVG panels again. It was my first time using them on the house so I picked up some things to make install go even faster on our next projects
I finally figured out after 2 months how to get to the DI site so I will do my best to answer any questions that you may have.
Shawn