A few days ago my SIL brought over his platform, new Cruzr saddle and Oplux tether for me to try with y Method saddle. I've hunted the last 2 years out of a JX3 which I love but have expanded my saddle stable with the Method wanting to try different ones. Anyway when I tried his Oplux Tether with a prusik if I was leaning the prusik held great but when I went into a sitting position the pursik would slip. Have any of you had this happen with you? I might need to clarify, I'm 62 years young, at 6 ft and weigh 270. This shocked me when the tether slipped in the sitting position. I was wanting to go to the Oplux tether with a pursik but now I don't feel it is the best option with my weight, I sure wouldn't want it to slip when at climbing height.