I swapped out wheelsets a couple of weeks ago and I swear I feel a difference. How much is attributable to wheels and how much to tires (and, for that matter, how much to imagination) I can't say, but the new setup (Neuvation M28X Aeros with Vittoria Rubino 23s) feels quicker and smoother than the old (OEM Shimano RS10 with Schwalbe Lugano 25s).