Ryan from HowNotToHighline tested many ways to tension slacklines on their efficiency, including our famous BLNC 5:1 slackline pulleys. We won't say much, we will just quote Ryan's judgement:
"That's REALLY efficient!"
"This is a really sweet, sweet setup [...], I use this on my highline rigs!"
"Wow! She's efficient!"
We don't have anything to add ;)
Watch the whole comparison:
P.S.: If you'd like to support Ryan's amazing work around highline science, please consider just buying some delicious coffee from https://drinkjunocoffee.com - his own small business. He will love you for this.