The Yates Big Wall Ladder stands out for its ease of use and comfort when standing in it for hours at a time. This is our top choice for aid-intensive big walls. It is a beefy aider, which means you get durability and comfort at the expense of weight this is one of the heavier aiders out there. In most cases the tradeoff for the extra weight is well worth it. This is a review of the 6 Step size. There is also a 7 Step size that is recommended for people over 6 feet or who are doing harder aid.
Overall, this is our favorite aider for most big wall applications and gets the OutdoorGearLab Editors' Choice Award. It is only on mainly free routes such as The Nose or Regular Route on Half Dome where we would use a lighter aider such as the Petzl Wall Step Etrier. Another highly rated webbing ladder is the Metolius 8 Step Ladder Aider.
See How this compared to the other aiders and etriers that we tested in our complete Aider Review.