I have now had 4 marathon ropes of different diameter and they are bomber. They handle well and don't flatten out over time like some ropes. The 10.1 is probably the most versatile size as it is perfect for multi-pitch routes to sport climbing. Comparing this rope to others, it has great qualities in relation to its weight as it is light for its diameter(grams/meter), relatively low impact force, and the elongation is at a good %. The sheath takes abuse well and its great for climbing on course rocks like granite. I use the 10.7 marathon for a big-wall climbing rope.