While I don't see eye to eye with Pierre Hedary in all cases, I do respect his knowledge and opinions. Please watch this video of Pierre's in response to your questions. He has a few other videos that will help round out this topic for you.
https://www.youtube.com/watch?v=uE2sEl9I3VQ
My personal opinion is that if you don't/can't work on the car yourself, it can get pretty expensive, pretty fast.