It seems some are expecting too much from a line cutter. It should cut line, all day, every day. Line, line and more line. Small, convienient, out of the way. It's a line cutter. A line cutter with a steel blade is 90% usless after 5 dives. The sheath holds moisture against the blade, and the thin part corrodes first......i.e the sharp edge.
A line cutter that can cut rope may be nice, but I've never been caught in rope by surprise. Line? I got caught last week. That's a line cutter's job. It cuts line.
My knife cuts rope. Carry both. Each had a job.
What line cutter do you use? Does it rust after certain number of dives?