How long have you had them, and how often do you ride in them?
I've had them for about a year now. I generally ride in them 1 - 3 times per week; both normal schooling sessions of an hourish in the arena, and also on day long trail rides. I am not the best at doing regular cleanings on my boots, but they still are in great condition and polish up well enough to show in them.
I don't know which ones I have. I just know they are Mountain Horse tall boots with black fleece lining. I got them last November and rode in them 5 days a week all winter. So far so good as far as holding up. Very warm!