The models of the Vitesse sold in the US at the moment are not current. I was told the 2006 HP model would arrive in July but don't see it on any US website. Now they tell me there are 2007 models coming out and will be in the US by Oct. 15th. The 2007 model is the HP wingflex is heavier than the 2006 model.250 vs 265 g. I also see a Vitesse Twin Tech (250 g). The one you can customize on Fizik's website is 240 g but doesn't have scuff guards that both the Twin Tech and Wingflex models have. It is hard to get any answers about differences and availability. I'm leaning at getting a Twin Tech but would like to understand the differences between the Wingflex and Twin Tech models.