I'm not a huge fan of spread to book, probably because of how I've searched on here for 10 years. It would be nice to be able to set a standard if you want to use average blackbook, clean blackbook, etc on the search page. Ideally for me theres a clickable drop down style function on each "SRP" where you can quickly view all values on main search page relevant to that car. Could still include spread as potential default option as well as the book of your choice.