I purchased two of these slings this year, one each for myself and my 17 yoa son, and we are both very happy with the sling. I have been hunting for 38 years and have used many types of slings and this is the best by far. I had right shoulder surgery two years ago, which is the one used to carry my rifle, and the difference in "carry weight" this sling makes is huge. The cost is very reasonable and well worth it.
What I like about the Butler Creek Comfort Strech Rifle Sling is that it is light weight, it is not bulky, and when you are out hunting and walking all day, climbing uphill and downhill, this sling provides the best comfort on your shoulders with it's streching motion at the end of the day when you are really tired.
I have been looking for comfortable slings that handle the weight of a pair of my double rifles. I finally asked an aquaintance of mine who happens to be a PH in South Africa. He highly recommended the Butler Creek rifle sling based on his years of using them. That was good enough for me and he was spot on. They are the most comfortable slings I have and I expect they will be the most weather-resistant as well.