inner tube quality

Increased flexibility giving increased comfort and better speed (tube deforms more readily over the road imperfections causing less resistance/slow down)

Only Smallfurry can actually notice any of this though :-)

I actually only use them with high end tyres, and use butyl ones with stiff commuter tyres so I s'pose I might be buying into the hype.

He has the arse of a princess.

Shaved, and massaged with assos cream, on a daily basis. I can tell which road I'm on by the feeling through my saddle alone.