I've ordered these strings several times for my horse bow. They seem to last 8~ months with me practicing weekly Hungarian style horse archery (100+ shots per practice). The serving tends to wear out around my nocking point but otherwise they work great and stand up well to heavy use. Ordering from Canada Archery has been inexpensive and easy.
So far after shooting I have not noticed and major stretching of the material. I have only noticed a slightly frayed part in the string but has held up well other wise. I have been storing the string in a hard case for an Olympic recurve. Shoots fine and Easton G Pin Nocks attach easily to said string. You get what you pay for and its good for the price.
Very good bow string at a great price. It does its job very nicely. Buy it in complete confidence.
It's not the highest quality string but it works fine and has lasted over a year on my longbow so far with a bit of fray starting to form under the knock point. I do wax it every few hundred shots.
Dacron string... no issue.