Worth every penny despite the higher cost
This is my favorite tennis string. It is expensive, there's no hiding from it, however, it offers the best combination of feel, control, power and comfort of any string or hybrid combo that I've tried. It allows me to play through occasional bouts of tennis elbow without the condition worsening, and I know I experience this less frequently playing with natural gut from past experiences playing with polys and hybrids. I prefer the 15L diameter due to its better durability than the thinner options. I personally do not notice any significant lessening of power potential or spin when using 15L vs. 17, for example. If you can afford it, buy it. It's important enough to me, with as frequently as I play, that I sacrifice other things to ensure I can keep a full bed of this string in my racquets.