I did about four years ago. I found it very interesting though there is a lot of hanging about. Take a good book. I was surprised by how many cases, 80% of those I was called for, involved sexual exploitation of young people. All girls. You will be instructed not to discuss ongoing cases with anyone. One evening my wife asked about a case - it was a two day one. I refused to say and she got quite cross with me. The following day I told her about the case and her immediate reaction was "guilty." Which left me then to explain that was why I didn't speak about it before as she would unwittingly have influenced my view. The guy was actually clearly guilty but there was no evidence. It's a hard job and depending on the make of the jury you may get some surprises.