Michael the advantage of using a dealership for servicing is the warranty, I am sure most dealerships want to do the right thing for their customers, you bought their product and have the vehicle warranty and also they want you to continue to buy their product so out of all the options using Toyota to service your car while under warranty is your best option. However you can always do some research about good mechanic's in your area. I have used the same mechanic for over 15 years in my area, the main reason was I went to him with a huge issue he went out of his way to help me, even costing himself money to attempt to fix the problem and being a family operated business all his staff and family made us feel wanted and respected. You can always then go to them after your warranty is done with or if unhappy with Toyota you have a fall back but do your research thoroughly ask questions lots of them about the mechanic etc
So my advise is yes give them the opportunity to look after you, let them know of your concerns and that you EXPECT top notch service right up front don't pull any punches and see how they treat you, you have rights and you have protection under their warranty, let us know how you get on mate
Keep Safe
KAA