One came with my Akuma Phantom II helmet and I absolutely love it. The helmet was pricey, but is very light and comfortable. The visor is the best part though as I leave the house in the morning when dark and come home in evening when sun is bright. The visor changes as the heat and UV rays increase or decrease. In the morning it is clear as can be, in the afternoon it is so dark you cannot see my eyes through it.
Love it, you will not regret it if you can get one, even at a premium price.