I am interested in seeing RH's response to this question, but thought I would give you my :twocents: as well, as we have had this rule in AZ for several years now.
1. The judge reviews the questions, and the questions are asked by the judge, not by the juror.
2. At the end of the testimony of a witness, both sides review any jury questions and make objections outside the presence of the jury. The judge rules on the objections and either asks the witness the question(s) or tells the jury that the question(s) could not be asked due to the rules of evidence. If jury questions are asked, both sides have the opportunity to ask follow-up questions of the witness.
3. Since this rule has gone into effect in AZ, every jury trial I have done has had juror questions.
4. There is no limit on the number of questions, but they do tend to slow down a bit after the judge responds to a couple of them by saying that the questions cannot be asked. In my experience, the jury questions have never significantly added to the length of the trial.
5. I'm not a criminal defense attorney, so I don't know if they think the rule sucks.
But I like it, because it helps you understand what the jury is thinking as the trial goes along.