Tom regarding the wear on the Lockjack, I attributed that primarily to always running my doubled rope through a pulley when using it. This forced the Lockjack to carry a heavier load in regards to friction control than what most experience.
As far as rope cleanliness, I am a bit of a fanatic. When my ropes get dirty, they don't get washed they get replaced. They get relegated to secondary use, often times to be used with a hitch climber and VT. But anything I run through mechanicals, I keep clean.
I can't explain the wear, other than the fact that these last months I have been using the Unicender exclusively for rope access in the frog walker system and then for SRT working the tree. I often use the advanced friction control, because it is easy for me to work. But I don't come blasting out of the tree.
However, even though I consider myself semi-retired, this Uni does travel a lot of rope miles. But I would expect this unit to be rugged enough to handle much more abuse than what I have thrown at it, because I know the typical tree guy and what they are going to expect of equipment.
Dave