Hankook Ventus V2 Concept H437 is a High Performance Tire, not Ultra High Performance Tire.
These Ultra High Performance Tires(All-Season) are rated at 500 or higher: Michelin Pilot Sport A/S Plus, Continental ExtremeContact DWS, Yokohama AVID ENVigor (W-speed), according to Tirerack.
I don't expect Ventus V2 Concept H437 to perform as good as Ultra High Performance Tires, Summer or All-Season, or even High Performance Summer from other manufactures. But the price is much lower at around $90-100 for 235/45-17. I may pick this Hankook tire when I replace my DWS on my E430 next year.