I recently purchased a car from this dealer, first using the internet to get a quote. Sesi provided me with the best quote up front, without having to do any haggling. They also did not call me 30 seconds (and many times later) after submitting a quote request and handled most communication (insofar was possible) by email rather than calling and calling. We were made aware of "extras" (extended warranty, etc.) that we could purchase prior to finalizing the sale, but were not at all pressured to add them to our bottom line.
I must say that this was, hands down, the easiest, pressure-free car buying experience I've ever had. If you're in the market for a new Mazda, definitely consider Sesi - fortunately, for us, this was the closest Mazda dealer to our home!