I LOVe THIS STUFF!!! got a 250' roll from Home Depot for about $5 and you can practice splicing it just like Amsteel. Let the Splicing begin!!!
I have played with Amsteel making my own whoopies and soft shackles but I still like to practice on something cheaper because the budget is tight.
I am using one of the coated strands from inside an ethernet cable and its like butter on the mason line. I am definitely planning on making some more soft shackle prusiks to hang do-dads on my hammock RL out of this stuff.
I am also planning on using the mason line in conjunction with some shock cord as my guy lines... now just to finish my tarp