Actually, the interesting part is I have a regular mechanic who had been working on my dad's cars (and knows me because I used to bring his car in frequently). During our recent servicing interval, he actually advised us to bring our cars to TC during the warranty period....
His rational is for minor servicing, he is not much cheaper (and its true..) and for major servicing (20,000, 40,000 etc), better to go back to TC because of warranty issues.