- does it (is there?) affect warranty
- I dont trust any mechanic, wont leave my car for a minute but sit always
beside. If they wont let you, find another place.
- check out the issues covered in that maintenance compare to normal
services your mech does. Is he adept? Special jobs may be better serviced
in special shops - may. So if theres no warranty issue and you pay all,
leave the trivial filter issues to local shop, buy general filters: youre
the boss.
- screw is just a screw, but generally stealerships want to $crew you
more...
- for A/T its best to find a place which changes all A/T oil, not
stealership redne$$ check.
see http://www.cardomain.com/ride/748507/24

Who would have the most experience working on your make and model.?

and please - no "dealers always screw you" rambling replies - thats
not true, and  at least with a dealer, if you feel you got SCREWED you
have recourse.