I've been in Memphis for just over four years now, a transplant from So. Cal. I got a lot of strange looks from people around here for that for a while... "You moved to Memphis from Southern California? Why?"
Anyway, I can't compare Memphis to Kansas, but I can say that the cost of living is way cheaper here than in CA. As mentioned, there's no state tax but sales tax is in the 9.25-9.5% range across the state.
Relatively flat & green as mentioned, and hot in the summer. Usually only one or two days of snow in the winter. The heat does suck, but strangely I'm starting to get used to it. Mostly I just stay indoors when it's really humid though.
Some say that Memphis should be part of Mississippi, as it's different from the rest of the state. I suppose that's so. Speaking of, we're only about 40 minutes from Tunica MS, with its casinos. Food & entertainment here is good, but not as many options as I was used to in So. Cal. (yeah, I know, I was spoiled).
I don't have children, but there seems to be issues with the public schools in Memphis. The school board and the mayor regularly have screaming matches with one another, which of course makes the news. Many people I know have their kids in private school, or live just out of Shelby county and put their kids in other school systems.
As I said, the cost of living here is pretty good. Housing is far, far cheaper here than on the west coast, and gas prices seem to usually be just below the national average.