I only picked up my car the end of November, so I fall into the "later build" category - some of the TSBs don't even apply to my VIN #, but I've still had issues.
Don't get me wrong, I'm VERY happy with the car overall and my dealership has been excellent... I knew what I was getting into buying a first-year car.
I've had the CEL issues (IMRC Valve) -- showed up after 2,000 miles.
The Satellite Antenna now needs to be replaced. It has "failed".
And the other issues I have with the Tech Package EVERYONE has -- it's just a matter of whether you notice or whether those things are important to you. It's nothing "broken" per se, just bad design. Part of it is my own fault for not spending more time thoroughly testing it -- and part of it is Mazda's fault for skimping on things (for no real reason), and for having programmers and designers who didn't thorougly test.