We plan to really give it a UI and UX scrub and upgrade as soon as we have some funding. We are operating an MVP right now gathering as many data points as possible and trying to figure out which tasks need implemented first.
Have you considered trying to capture the amount of time it took to get from prospective buyer saying "Let's talk about a deal" to discovering the final price ?
Since buyer's time is valuable, and wasted negotiating time frustrating, having a friction-free non-delayed experience would surely be a valuable data-point to many -- as in "I don't want to use a dealer whose average time-to-final-price is more than 30 minutes."