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I used to put slicks on my GT Aluminium hardtail to go around and join the local Critical Mass rides. Massive improvements over the knobbies.
I am not really sure about sewup in use nowadays. Part of the reason is about weight distribution on the 26in. The little weight of clinchers on the edge actually helps if you go long distance. You tend to coast easier as rotational moments are bigger and therefore dissipate less as you coast. Less effort to maintain a certain speed. But if you're doing Keirin/Time Attack you'd go simply for the lightest or with less thread count/ply.
You can see this effect on cars. Big cars that used to be on 13in rims now sport 18in. They help on the highways to maintain speed so you could just feather the throttle. But they suffer in stop-go traffic where smaller tyres fit the usage profile.
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