I use lots of different equipment for all my hobbies. I also demand a lot from that equipment and I expect it to preform as it is advertised. When stuff fails it is not only frustrating but it can be down right dangerous. Sometimes gear fails long before it's intended lifespan and requires warranty replacement by the manufacturer. Some companies that I have interacted with have responded better then others, and have created brand loyalty through their customer service. The following is a list that I have had positive experiences with, including the incident that sparked the request.
Obviously not all of the companies I have interacted with have ended with replacement gear and nor should they. These business are there to make money, but sometimes their equipment fails. When this happens they should stand behind their products. The companies mentioned above have done an exceptional job of providing customer service. On your next gear purchase, consider supporting some of the above companies.