A piece of art? Yes.
Something worth seeing? Not really.
The story behind this spire is cool as this was originally designed to sit atop the Arizona State Capitol Building. Unfortunately for Wright, it was rejected by politicians. Wright passed thinking this was a rejected piece. Later it was built and stuck on the side of the road for all to see.
While it's cool, I think it deserves to be around more art. You drive by, see it, and keep on driving. Not a big deal.
If you're a Frank Lloyd Wright fan, go to Taliesin West for a tour instead.