That sounds pretty nice having the extended time for a chemical bond. I just re-stocked with 105/207 for upcoming projects though so it would be a while before I have the opportunity to try anything new.
The precoat means you don't need to worry about the epoxy absorbing in any one area, so you can simply apply a lighter coat and not worry about starving the cloth. The sqeegeeing takes care of any excess, so runs really aren't/weren't a thing with the longer cure.
The recoat regime with the System 3 really does make the epoxy application a much simpler process IMO.