I have been using Invision to create rapid prototyping for about three years. Here are screenshots of all my current prototypes. My team appreciates it when I am able to show them a high- fidelity prototype in a couple of hours rather than days. I usually try to test the interaction with colleagues/friends and quickly share my findings with team the next day.
My favorite prototypes features in invision are:
• SMS to mobile
• Comment mode
• Fixed header