Ok so I have had both the single and double boa lacing system boots before. the string on my double boa boot snapped once but that's because my boards edge was grinding into it when i rest it on my free leg on the chair so thats my bad. I thought that they were really comfortable when i was wearing them. Then last year I switched to Burton Ruler boots and OMFG are they good. They are wayy better than the boa system. The rules have an individual lacing system for the the foot and leg so you can tighten each section to your prefrence. They also feel really comfortable and are faster to get on and off than the boa. When I got them I was walking around my house for a few hours with the boa boot on one leg and the ruler on the other. The ruler was just as stiff as the other one, but felt a lot more comfortable. Its hard to describe but the boa boot felt like it was some kinda of mechanical contraption on my foot while the ruler had a very natural feel to it. Dont know if that helps but thats the only way I can describe it. Check out your local shop and try on both at the same time and you will feel the difference. I used to be a DC only person, but now I am sold on the Burton boots. Good luck.