I love these boots! They're very comfortable and look cute on!  The calf width is great - fits my muscular calves perfectly and I can even wear them over my jeans.  My calves are 15" around exactly and these fit very comfortably.  But - the zippers are AWFUL!  It takes me 5 minutes to get them both zipped up in the morning because the zippers stick. It would be easier if the zipper tooth were larger, but it's tiny so you can't get a very good fighting grip on it.  But anyway, a great boot if you don't plan on taking them off and on throughout the day.  I'm wondering how long the zippers will actually last...

UPDATE 1/2/12

I've changed my rating from 4 stars to 5.  The zippers have actually gotten much easier to zip!  Love these boots.  I just bought them in black also!