i just picked up a set of the Nokian Hakkapelitta w240 after doing a bit of research and have been breaking them in.

First impressions if your use to riding slicks, especially 23c-28c's you will feel the drag. Its not terrible, but you wont be able to keep speed while coasting, its more of a continuous pedal. There not too far off from knobby cross tires though and id imagine close to the feel/weight of mtb tires.

If you only have 1 bike and 1 wheelset id throw the studded tires on and leave them on. Not that changing out tires during the week is that much effort but it gets to be a pain after a while.