[alexsilver]

We are going through the same approach with our current beta customers (and will be making our demos available to a wide audience in the future too) and I can attest to the validity of this approach. We make it very clear to our customers that this is a demo and their changes will go away if they refresh the page. We don't have pop-ups integrated since we collect emails on another page. I think event tracking should be sufficient but we'll have to see what the data says in a little while.

We actually also use these semi-live demos instead of mock-ups (since we'll be implementing the same pages afterward anyway) since only one of us is proficient with Photoshop but everyone is comfortable with Bootstrap. It serves as a testing ground for various approaches for JS code too.