having a pair of fs's and living in wisconsin, i think i can answer this question from vast amounts of personal experience. they are not bad. not great, but not bad. if you are going to use them as elongated ice skates, i wouldnt reccomend them, but as far as the occasional icy day goes, they still ride nicely. i love mine.
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i ski a good amount of ice and i have scratch fs. personally i think they hold pretty well. only a race ski, especially atomics which hold amazingly, is gonna give you real good turns on ice. and just about any ski that has a good sharp edge is gonna hold decently on ice. this issue won't be a real concern to you