Naish and Ozone have always had great low stretch lines with a tight braid and are very resistant to wear.
North and Best lines (at least 2010-2014) were junk lines that pretty much immediatley showed wear even if you were not using them in a highly abrasive environment.
A tight braid with a waxy feel seems to be best.
But for cost and low stretch performance, I go with the Jerry Brown hollow braid spectra. This stuff splices great and has decent wear characteristics, though it is not "waxy" and somewhat a looser/flatter braid. But is no where as loose as some of the junk lines previously mentioned. I use 800lb for my fronts, and any other junk line (stock on any bar I get) for the rears. I also have some Marlow tight braided spectra kite line that I believe is 350kg, but still nice and thin for back lines. Here is a link for BHP tackle where you can get a really low price on the right sized spool (300yds is plenty for maintaining a few bars).
http://www.bhptackle.com/home.php?cat=46
Stretching and splicing is 50% of the issue with kite lines. You need to take your time stretching and stretch to within about 80% of the breaking strength. Then you need to take more time and let the lines relax. For fronts, let them relax for 15-20 minutes before making the final splices. Rears are better left for longer, but can be done in a pinch after a second handling and a 20 minute wait. - Again THIS WILL MAKE OR BREAK YOUR LINESET PROJECT! There is more to it than I am laying out, but I am not going to write a guide for you right now. And just for clarity, you need some mechanical advantage to properly stretch you lines. But be careful as the stored energy release of a snapped line can hurt you pretty bad.
Q-Power line is great, except for the terminations. If you knot, you must make a perfectly neat "figure 8" knot or you will easily break at that knot. If you machine sew sleeved loops, make sure you wet the line and the thread before sewing. Then go slow with the machine. If you don't follow that advice, you will cut individual strands in the Q-Power line and severely weaken the splice. Honestly, I abandoned my Q-Power line sets after a few breaks at the sewn sleeves, and then later at a less than perfect figure 8 knot.
MutantWizard wrote: ↑Sun May 13, 2018 7:36 pm
A while back heard some good comments but also some bad comments about Q-PowerLine Pro lines but that might be outdated by now. I would appreciate any experience or advice members here have with these or a recommendation of any other lines you think would qualify according to my criteria.Thanks!
Q-power line has not changed and all the issues with it still exist and will always exist. It can't be spliced as it is not a braid. So knots or sewn loops become it's "Achilles heel".