We have used Dealerskins for over a year now. Their SEO seems to be decent, but their overall design lacks tremendously. I may be nitpicking due to my web design background but I feel we could do better. Their support is average thus far since I took over the position of Internet Manager. Ive contacted them twice about re-design options but have yet to hear back from a project manager of any kind. We are currently searching other options such as Dealer.com and Dealeron.com.
Dealerskins backend site manager is very archaic. The site editor is very limited for anyone with any kind of basic HTML experience. Their design optons would be good for a dealership who is looking to update from a site built in 1995, but if you are looking anything "cutting edge" you might look elsewhere.
Ultimately, you get what you pay for so be careful.