WOW guys calm down .. I'm not stating this new set of wheels made me faster than I normally am over the same distance and they were the sole reason for the six minutes gain I arrived at my destination. I've ridden this bike for three years, so I should know by now, how the bike felt with the other set up I had, the only tyre difference is going from 25 Gatorskins to 28 Gatorskins (25's going on my sons bike) I also removed the lights + battery pack + spare battery pack (for my phone using Endmondo).
IMHO the bike feels different, more responsive, lighter and a bit more comfortable, I never cycle out of my comfort zone, I always chose the gear I know to use for that particular stretch of road (I've cycled this route untold many of times) I will say though, I was able to use the next gear up and still maintain the same level of comfort, read into that what you will.
I want to put more mileage on the new stuff I added, then I can give a honest opinion was it worth it, from the few outings I've done so far, then the bigger smile factor is yes, but time will tell
Norm