Zion Healthshare SD, anyone have any experience with this company?

Thank you for a very good reply. 

I just re-read my post and need to correct something I said.  I said, "I don't know of any company in Texas or Florida that offers access to a nationwide network."  What I meant was Texas or South Dakota.  South Dakota hasn't had health insurance policies with a nationwide network for a long time.  Texas had them through Blue Cross, but then Blue Cross stopped offering those policies and changed to HMO only.  That was maybe eight or ten years ago? 

Which leaves Florida as the choice for people who need pre-Medicare health insurance.  Florida isn't the only choice, because there are nationwide policies available in some other states, but Florida, Texas, and South Dakota are the "big three" for fulltime domicile, and Florida is the only one among those three. 

A person might have a reason to domicile in a different state from those three, and it's possible he could get a policy with nationwide coverage there, but there's nowhere near as much discussion about the health insurance landscape in those states as there is for Texas, South Dakota, and Florida.