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I have them in a bike that came with them on, so I left them. Touch wood, never had a flat that needed repairing, though have had puncture as the pressure does drop and you can tell till you pump them up again.
Feel no different to the bikes without sludge whatsoever.
So, not that I would have bothered with them left to my own devices (though I use them on my motorbike) for fast road work (I use them on commuters and kids bikes) I have to say I rate them.