Early in my career, I tried several different boot manufacturers...but since my first pair of Bates (Ultra lites, before they were called ultra lites!) I've never gone to anything else. I wear these boots between 8-12 hours a day, 5 days/week in the summer, and full time in the winter. Each pair lasts about 20 months with that much use. Never had a problem with the zippers, stiching has always stayed in place, and boot takes a good shine on the rare occasion that I have to do that. I'll continue to buy Bates as long as I keep getting this top notch product.