i ride tufos on the road [s22s and jet pros.]
the s22 is tough as fu<k. i don't know how many miles i've put on them but after almost two summers they still look like new.
they're a bit slidey in the wet though
the jet pro is more grippy and stable at the expense of life. once again, still pretty tough.
the best bit is that my bike feels like a tie fighter on them. [trust me on that one].
avoid vittoria rallyes like the plague [lumpy, unstable in the dry and *really* slidey in the wet].
contrary to popular belief, tufo sealant doesn't clog up valves as long as you remember to pump up your tyres with the valves at the top [away from the sealant which rests at the bottom of the the tyre when stationary].
otherwise as soon as you open the valve the sealant is forced out and over the carpet. and it's a cock to get out. errr... i'd imagine.
fsnl
sparky