Real common question.

If your old wheels are in good tune you shouldn't notice much difference when riding. All those wheels are a good chunk lighter than what you have, but you would need to do a lot of climbing to gain any kind of time difference, and if you are not racing then who cares?

The Vitesse features wider rims then the rest, so if you ride rough roads you could drop the pressure a bit to smooth things out without an increase in pinch flats. You may get better corner grip and braking, too.