I have passed stuff on to T's that were brutally honest, and they seemed to take it well. Most of my T's have been ok getting criticism around their work, as long as it was presented in a constructive way, or I was able to explain where I was coming from. Just Friday I read some stuff ot my T that she said was very helpful, and I was worried would be hurtful to her. I think going back to revise it to sound less like an attack, and more like somethign I was having trouble with helped a lot. I was able to ask for her to change the way she does some things, and explain why those changes may be helpful. She seemed totally ok with it all and actaully thanked me for telling her. I think most good T's are pen to making the T experience better for their clients. They are also open to knowing that clients will have strong emotional reactions to things, and that sometimes those things are relavent, sometimes not.
There are still things I prefer to have my T read on her own, so I will just hand her that stuff and ask her to read it. She keeps trying to get me to say it, but is ok with me refusing. It's generally the more vulnerable stuff that I cannot voice yet, but can write out.