Ok ** Cam ,whatever you say
anybody with real cycling exp is likely to have experienced the fun of going from a heavier clincher to a race worthy one, and felt a big or quite noticable improvement in acceleration with a better tire, as well as rolling nicer, better handling, more suppleness/comfort, esp with good tubulars.
As far as the Mtn bike test goes, I can vouch for the performance of a popular hi end Cross country wheelset with tubless tires that were so much more lively, and the option to run lower pressure without pinch flats was nice, the only catch is dealing with flats with a tubeless system.For X country racers, its a good gamble for sure.