I've used one set of Toyo Proxes 4 on my Pro. They are relatively expensive, annoyingly noisy, dangerously slippery in the wet, and have terrible treadlife (I might get 15k). The Proxes 4 have no redeeming quality--their dry grip is average at best. The Falken Ziex ZE-912 I had previously outranked them in every way. Simply, there is absolutely no reason to buy the Toyo Proxes 4 over other tires.
Consumer Reports published a review of UHP tires a month after I bought the Proxes 4 and they gave low ratings to them as well, for the same reasons I've noted. The Falken 912's did very well in the test.
If you need decent performance in the snow, neither the Falkens nor the Toyos are a safe choice.
I've criticized the Proxes 4 a few times on this forum, and I hope it helps fellow forum members avoid wasting their money.