Just purchased my 2nd pair! First pair held up well, with the usual, inevitable breakdown of material...such as separation where boot joins sole! I'm still wearing them, after probably two years plus of performing maintenance (indoors/outdoors) in both clean, and very dirty environments. They have remained very comfortable, and supporting throughout the time I've been using them. Never experienced any problems with ample side zippers! I take fastidious care of all of my shoes, and my only complaint might be, that the leather or faux leather toe area would not take a decent shine, after about six months of use. Otherwise I am quite satisfied for the money I spent. One last thing...although not waterproof, the boots faired well in wet situations!