I ran a mobile phone voting session at the Guy's Hospital South London Study Day/ Advanced Airway Management alongside Dr Imran Ahmad (Consultant Anaesthetist at Guy's and St Thomas' NHS Foundation Trust). This produced lots of interesting discussion and some interesting charts. The longer the session went on the more focused the opinions became with some potential answers being dismissed altogether as the audience was became more and more informed - learning in action. The feedback was refreshing. It seems people enjoy interactive sessions like this and this is really no surprise. With the smaller number of people here (and an average response of around 40 people per question) the lecturer was able to encourage people who had chosen less popular answers to discuss their reasons. I'd say it worked well. Here is the feedback, which demonstrates the value of interactive case based discussions.
Main site: subjective-effect.co.uk