Alright well this may not be exactly helpful (and sorry for the bump, I've been out of town) as I know NOTHING about the Memphis CF care, but I go to the clinic in Nashville at Vanderbilt (it's about a two hour drive from where I am [from the opposite side], probably about a three hour drive from Memphis) and I've been going there since I was very young. It's an absolutely incredible clinic, very professional and up-front and down to business yet VERY friendly and helpful, they will -and have many times- bend over backwards for my brother and me.
As for LIVING in Memphis.... maybe it's just that I've lived in TN too long, but I wouldn't touch it with a ten foot pole. I suppose it very strongly depends on what PART of Memphis you live in, but anywhere else in TN all you hear about Memphis is robberies, shootings, murders and (if you're a Christian) crazy spiritual warfare.
Like I say, I've never lived there, so it's all hearsay, but I've heard a lot of hearsay.
As for Nashville, I can't say enough, I have lived in and around Nashville, and even now as I am currently living in middle TN (two hours east of Nashville) much of my work is done in Nashville. I love the city and the people and the clinic!