So, I'm trying to do more manual focus, but I'm having issues at times, likely due to the way dSLR manufacturers have prioritized auto-focus over manual focus in their AF systems & focusing screens.

I changed to a grid screen in my 40D, use it for leveling the camera when I don't have or want to put a level in the hotshoe. Haven't bothered switching my 1D from the standard screen since the grid ...