Rhizomatous Tall Fescue?

Hi! I'm new to organic lawncare and to this forum.

I recently read Paul Tukey's The Organic Lawn Care Manual, in which he references Rhizomatous Tall Fescue (RTF), which seems to have the advantages of tall fescues as well as the advantage of being rhizomatous.

I'm wondering if anyone here has any experience with RTF, and a recommendation one way or the other. I live in Sioux Falls, SD, which is on the Zone 4/Zone 5 border.

Thanks!

Chris