Definitely take it in. Make a laundry list of things you "hear" complain about. Even if everything checks out and nothign gets replaced, you know everything was checked out..
I do this on all my cars, before warranty expires.
have had transmissions replaced, A/C systems and few other things that I never knew were bad.
Even had failed lifter and ruined camshaft replace before I ran out of factory warranty that i thought was an exhaust tick.
Bottom line, you are not a professional mechanic so let them check it out, if you take it ina and list no issues, they will drive it for afew miles and call it good. List issues and they will really pay attention to how it shifts, runs out and whatever else you mention.