Just to clarify, CA uses Samsung rope, well-known in the equine industry and is very strong, but also very stiff.
PNW Select rope is by some of the main people that worked with Samsung, but split off to make more variety of rope, including colors (over 16!), and different stiffness. They have halter cord, which is comparable to Samsung's rope; Accessory cord, which is more flexible; and Stable braid, which is very soft and flexible and I highly recommend it for foals and other sensitive horses. All in all, though, same excellent quality and it's not cheap.
The crafsmanship is also very high because the rope is spliced, rather than clamped or made with other not-so-great methods. I make all my stuff by hand and splice my work, much like CA, maintaining the rope strength. I don't use those terrible metal clamps and just fold over the rope - it's actualy spliced right back into itself maintaining 90% of the rope's strength. I can make them like CA does, but I prefer not to loop the hardwear on because even that takes some strength out of the rope. These ropes do not break - not in the rope or the attachment. They also wear like iron and maintain their shape, flexiblity, color, and durability and do not fray. You'll have them for life.
Due to the cost of making high-quality tack, I'd say the brand-name prices are only a little high. My halter and lead set cost about $60 - so you're paying $10 for the brand name. I do my homework on other business selling comparable products, and the ones that use the same high-quality rope all charge about what I do.