Una, they work for me, because I wanted more options to wear with my long cardigans and vests, which I thought would be kind of nice with leggings if not for the fact that cardigans are open in the front. And the leggings with cardis and vests give me another way to wear my arty tees. So I would say the key impulse in buying them was having a wardrobe need I thought they might fill.
I agree with UmmLila, they feel like leggings, not a skirt.
Rachylou, one point of the skirted leggings for me (as opposed to wearing a skirt over leggings) is not having to find a skirt that looks right with the leggings. That is, not having to find another item to make up an outfit. And the other point is not having an extra waistband. The waistband on the Eileen Fisher leggings is as comfortable as it could be, smooth-feeling and -looking.