Gorgeous! I have a "Great White NOID" too. It's flowers went from 4.5 inches last year to 5 inches this year. Took me 2 years after I saved it from Fred Meyers to see it bloom because my clumsy mother and brother broke the spike on 2 separate occasions!
They are no longer allowed in my growing areas.
I'm not sure how old mine is but I hope it eventually gets as many flowers as yours does! It seems to stop at 4 blooms. There are more tiny little buds at the end of this spike still in their tiny sheaths, but they aren't doing much, if anything right now. Is there a way get more flowers per spike, or do I just need to do a better job growing it?
Here are some pics.