I purchased Fusion HR1 tires two weeks ago. Yesterday we had a smalish snowstorm and the tires performed very well in snow. The traction control hardly ever needed to engage. I knew from research that they had good dry and wet traction but was surprised about their snow-sleding capabilities. We'll see how they hold up. The best thing of all is the price, about 70 USD per tire.
I had Fuzion ZRis on my 951, they were awesome summer tires. I had a Bridgestone guy that I knew on Rennlist tell me that they are 90% of the technology of the Potenza SO3, but for half the price. When my 540 needs tires I'll be looking into the HRi.