This is one of the few strings that I've tried that doesn't lead to tennis elbow. This string typically lasts me about three weeks hitting 3-4 times a week.
I used to use another multifilament, especially for stringing other people's racquets. But that string is no longer available, so I now use this product from Head. It's soft, has good feel, and seems to have good elasticity. And its more reasonably priced than an nxt or technifibre product.