I am using one of these right now. Like Walker stated, they are thin, so you need to control your heat when adding extract and boiling, as it can scorch. I stir a lot with mine. Hopefully my Sanke 15G keggle will be done next week, so I will just be using the pot for small items and sanitization.
If you notic the enamel chipping off, it is time to replace, as the steel underneath will then corrode when exposed.