I've been cutting my own hair for about 11 years until I decided to grow it out (I don't touch long hair). As a born and raised New Yorker, I'm very picky on barbers especially for low fades, skin fades, line ups, etc. I highly recommend Jeff and Joe as they are perfectionists and can fade to very high standards. From what I have seen, I would go as far as calling them the best in Phoenix.
There is a great barber shop closer to where I live but I take the extra 3-5 minute drive to head to Steve's. The owner, Steve and his wife are very good as well but for skin fades I recommend the younger barbers Joe and Jeff. They work quick and cut for a great price although I have a set price with tip usually (by choice) as I get my hair cut weekly. Again, their flat rate and ambience is great and I gladly tip these perfectionists. Best in town and maybe best in Phoenix.