My Uro/surgeon made a very serious point that my IGRT would likely stall my incontinence improvement, so we did wait for a couple of months beyond his "minimum" time from DaVinci to start.
My bad news is that the incontinence actually has gotten a bit worse from the point at which I started IGRT, but that also was a side-effect warning.
Now, both my uro and gp refuse to say that I will never get any better. I think that the idea of freezing progress is not so absolute as it is generally made out to be.
As to ED, well, they took the nerves (I had G4+5 and EPE), so if there is ever a sign of life it will be a miracle.
I've seen a book where the author makes repeated reference to the idea that what is best for killing PCa is rarely the best for the patient. I have to say that I agree. I'm 57, and the idea last year was to get me cured. I should have bought stock in Tena and Depends. I may be (for now) "cured", but I've got more visible problems now than I did before my "cure". Since I had no symptoms or problems, and the PCa was discovered by accident, in terms of Quality of life, I've had a major, disastrous, setback.
In terms of Quantity of life - who knows.