The question is: Good enough for whom?
I don't know, it's not for me to decide. Give it to your potential surgeon, let them decide. All letters require some clause saying, "Feel free to contact me for more information".
I never personally got a copy of my 1st SRS letter but I did see it upside-down in my surgeon's case folder for me. It was tightly written, single-spaced and covered 1-1/3 pages. I was surprised that there was so much there.