I've been using my Gamma LT for alpine and ice climbing over the last month in the northeast, and I'm very happy with the way it's performed. This weekend it received a nice range of conditions - hiking and snow scrambling in 5F temps on Saturday, multi pitch gully climbing and ice cragging at -10F on Sunday, and fast-paced top roping at 25F on Monday. This softshell managed my temps, sweat, wind, snow, and even running water beautifully. And it layers comfortably over my R1 hoody for a really ideal system (with 1-2 t shirts and a belay jacket).
The athletic cut is just right for layering underneath without too much excess material. Sleeve length is just right, staying just at my wrists where it belongs. The wrists have a tiny bit of stretch, but for all practical purposes are a fixed size - thankfully neither too big nor too small. The hem sits about 1" below my harness in the front and slightly lower in the back, so it doesn't interfere with anything. Collar is just tall enough to keep the wind off of my neck without restricting my head movement, even while belaying with a helmet. Pockets are completely accessible with a harness on, and will take a frozen 16cm screw just fine (be sure to cap them!). Articulation is fantastic - I haven't felt the least bit restricted even during the highest reaches. Wouldn't trade it for any other soft or hard shell, including my Alpha SV which is now collecting dust.