Scott,
If you are looking at TK Carsites or any other website provider, you should do your own research before listening to what other dealers tell you. Although there are many savvy people on this forum, doing your own research works the best, because you can focus on what is important for you.
What is your primary reason you are switching from BZ Results?
Do you feel like you are getting the traffic you should get? (Is it SEO related)
Do you want a website that converts better?
Do you want a website that has a better GUI?
Or a website that is easier to manage?
If SEO is your hot topic, then search the search engines for your brand or other brands and see who the dealers use that are on top of the rankings. Also use google's advanced query searches to find out how many of their pages are indexed (you can type site:
www.yourdomain.com for this)
If you want a website that converts better, then find out what other dealers' websites are converting at and how they measure it (compare apples to apples.) You can also add a popup form to your website instead of changing providers (we saw an increase of about 2% in our conversion ratio by adding the famous popup/popunder script to our front page)
Do your research then ask questions that are to the point...