I was DF'd twice (yep - wasn't smart enough to stay away the first time )
My first JC mtg was humilitating, embarassing, degrading - you name it. I was DF'd because I had sex with my boyfriend. And of course, the meeting had to go into every detail about how many times, for how long was this going on, yadda yadda - I was 20 years old and scared to death so I did everything I thought I was supposed to in order to show repentance but still got booted out. That JC meeting really hurt me because it was so humiliating - not only to have to answer the questions they were asking, but they made me feel like scum.
I eventually got reinstated because I thought I "had to" so I wouldn't die at armageddon. But I didn't want to be there anymore - I didn't see the elders as people who were looking out for my interests or protecting me. Instead, they were mean and could not be trusted.
4 years later I had my 2nd JC mtg - that one was much better. I'm not even sure why I went, except that I was still somewhat into the jw mindset and thought I had to go. But basically, I was there again for the same reason - only this time I didn't want to be a JW anymore. I wanted out. I felt like I had been living in a prison and I wanted to break free. So when the elders started asking questions I just blurted out and told them I didn't want to be a witness anymore. They were pretty shocked. In fact, there was one guy there that was actually a very kind brother and he almost cried trying to beg me not to leave. But I did - I got up and walked out. So I was DF'd a second time. That was the worst and best day of my life - for so many reasons that you all can understand.
Jump ahead 16+ years and I have gotten married to a great guy and have 2 wonderful children, went back to school and finished my BS degree, have a good job, and am really happy with life. So in the end, the JC meetings had a good impact because they set me free - but I wish I had been strong enough to just walk away on my own without putting myself through that humiliation and abuse.