I love them.
If you were to use the same diameter in a nylon you won't get the weight. And with a poly still more weight and more life/body. They last a long time, we have a couple that are going on 3 years old and has roped a ton of cattle. At Capriola's they are about $60? But we found them in TX for about $25. We cut the crappy hondo and burner off, tie a new one a slap a plastic speed burner on. However the cheaper Mexico ones get hot fast in your hand if you slide rope fast and they can burn through some horn wrap if they are wet from morning dew, snow...whatever. But we usually just use scraps of chap leather for horn wrap, it lasts just as long as elk or mule hide.
The only down side , for me, is that they get hard to use in the humidity. Here it is not an issue but was horrible in the part of TX we were in. They get moody with moisture.
I would recommend them to anyone who is roping a lot of cattle and going through ropes like crazy.
I DON'T LEAD 'EM AND FEED 'EM, I RIDE 'EM AND SLIDE 'EM.