The Slider – I don't really mess around with tyres to be honest, but of all the ones I have used I have found Speed Kings to be among the fastest tyre that grips well in a decent range of conditions. I've got the cheapest wire versions.
I generally keep the pressures up quite high which makes them a bit skittish on loose surfaces, but otherwise find them fine.
As for getting them on and off – I find all Continentals are difficult. Broke a tyre lever last week helping a mate change a puncture trying to get his Speed Kings off the rim. I've got Mavic 317 rims.
I won't be buying COntinentals again I think as they are such a pain. My Panaracer Fire XCs go on (and sometimes off) with no bother at all.