a3ng25wrote a review of Sterling Fusion Ion2 Dry Rope - 9.4mm on September 10, 2014
Familiarity: I've used it once or twice and have initial impressions
Short story: feeds smooth and fast like you'd expect of 9.4mm, feels great in your hand -- not mushy or soft like petzl ropes, doesnt coil up ridiculously like some ropes I've used, great color.
Long story: Coming from a Mammut Infinity super dry 70m 9.5mm, the differences aren't that big. The in-hand feel is slightly stiffer but just barely. Both are firm and smooth -- no mush. The weight loss i think is only a gram per meter, but whatever the technical difference, this rope still feels light and certainly isn't going to cause you any problems. I ran it up a 90ft this past weekend and it was still negligible weight drag at the top of the climb -- way better than something like a 10.1. the feeding may be the best part of this rope. It feeds like butter both directions; I use a grigri2 to belay and an atc for rappel and it's great through both. Had zero issues with the grigri being able to assisted brake as it should -- no noticeable slips or failures to brake. The 9.8m we also hiked in was not as nice to pull slack quickly. The dry coat is awesome; doesn't turn your hands black like the petzl teflon coating will. The color of this rope is more green than the stock photo lets on, but its still a great color if you ask me. The only possible downside to this rope that I could maybe talk about at this point would be the comfort of lowering -- lowering on this rope through a grigri2 vs using my old 9.5mm mammut infinity is that you feel a decent bit more friction in the hand rather than it being taken by the device. It's not unbearable, but it's noticeable. Can't really speak to durability, we've had it out on wall a couple days worth of climbing now, but no hard projecting or anything really tough for it -- no noticeable wear -- as I'd expect, having not really put it through anything rough.