I have used the Super Shuttle from San Tan Valley to Sky Harbor on two separate occasion and each trip has been well worth the money! I am leaving at 0430 in the mornings and each trip the driver has been on time and without incident. It prevents my wife from getting our two boys up and out of the house that early. I totally recommend this service if the need arises.
ps. Also a heck of a lot cheaper than taxi service and more reliable than Uber. Which I have also used in the past but that's a different review.