i would never wear them, or any other leather soled shoe, with jeans. to me, jeans are as casual as it gets, and i only wear them with the most casual shoes (sneakers, doc martens, campers).
Maybe it comes from having lived for years in L.A., but I sort of feel the same way about this. I'll very occasionally wear a pair of leather soled boots with jeans, and then only for going out to a club. Often, I'll just solve my internal dilemna by switching my jeans for a pair of slim, flatfront pants. Otherwise, it's sneakers or crepe soled boots or shoes with jeans. The whole leather soled shoes with jeans thing always struck me as a little tragic, like the poor guys with their over-produced hair and leather blazers, jeans, and leather loafers, waiting in line outside any given cheesy club on the strip (the Sunset Standard seems to attract the saddest liner-uppers) at midnight on a Saturday night. Having gotten that off my chest, I've seen the leather soled shoes/jeans look work really well, but only on hiphop types, who seem to have a knack for pairing mismatched things well.