I believe Tendon ropes are re-branded and also sold by Metolius, who offered us a discount on their rope for an expedition in 2014. It was a bit of a gamble taking the discount because we couldn't really find any info or reviews of the rope, but we decided to go for it and it was a great decision. It was supple, seemed fairly low stretch and has subsequently been used quite frequently by York University CPC without any obvious deterioration. I've not heard any complaints about it at all.