I bought mine at Jim Ells in Marietta. Lots of Sedans, few hatches. I just got lucky that they had one like I wanted.
Pleasant buying experience. I didn't trade in, so I can't comment on that. Decent price when I got mine.
Service has been not the best... Screwed up my car's programming when I got the personalization features adjusted and it took a call to Mazda and a few days for them to unscrew it up, but other than that, just oil changes with them so far.
I bought mine at the same dealership - Jim Ellis of Marietta. They were really knowledgeable and they gave me a killer deal, better than I could get from a close friend's father OR AAA Car Buying Program. I would go back there in a heartbeat. They also found me the exact model I wanted that was hundreds of miles away and drove it all the way here for me.
I just purchased a True Red, 2009 Mazdaspeed 3 from the Carmax in Kennesaw on November 1st. After the test ride was done, it literally took me 2 hours to drive off the lot, I was able to bring the check in for the car the next day. Amazing experience with that place, very nice knowledgeable people.
I did find out my car is subject to the windshield wiper motor recall and I contacted Jim Ellis Mazda to do the service. So far, they were very pleasant to deal with also.
I bought mine at Jim Ellis in Marietta as well. They are very helpful in finding just the right 3 that I was looking for. Also liked that they didn't put any pressure on you like some of the other dealers.