Yes I've seen and exchanged mental communication with a grey. He was very cute and happy. He appeared just as if he was standing right in front of me, no more than inches from my face.
I had been wondering about them, what they were about, if real and friendly etc..but just sort of casually wondering, nothing intense.
Then, one day while in deep meditation this grey just popped up in front of me. He mentally communicated to me he was there to say hi and show himself to me and did I have any questions. I was so thrilled and happy and thanked him for showing himself to me. He just said (mentally) I'm a friend, here to help and I asked if I could touch him to which he 'replied' yes, of course.
I touched his face and head all over very gently and was mesmerized by his eyes, which were very dark and looked like pools of black gel. Towards the end of our visit I wanted to touch them out of curiousity and he OK'd that. As I touched his eye it was like a liquid and indeed gel-like and after a few moments he went away and I got the feeling he said, 'Ok, that's enough'.