I've been a full manual guy since my old 20D days. Other than AWB I've liked to have full control of all settings.
Well, using my 1DX in a low light, no strobe, sports setting I tried the Auto ISO mode last weekend on a paid gig. I was shooting an indoor motorcycle jump and the images captured were running around 8K to 10K ISO. I was very impressed at the image quality.
I guess my point of this thread is simply to encourage 'manual shooters' to check this feature out. Due to the latest available high ISO bodies, this is the way to go imho.