If you need the oil changes, it might be worth it. But I don't, so I won't. I also had my oil pan nut stripped at one of these "non dealer" places. They didn't say anything and rigged it so it would hold in place. I found out about it when taking it to the dealer for other work.
While saving money is good, sometimes the hassle of these places is not worth it in the long run. The quick oil lube places are not hiring car experts. I'm not saying their all bad, but let's be honest, to get a job as toyota mechanic at a dealer, I'm sure it is much harder than whoever applies at the local big chain oil change place.
Granted, anyone could mess it up, including me, but i trust certain people more than others and do not place any trust in the quick oil change places.