That is what I have used for years and it makes very nice guylines. It has a good visibility. The sheath is woven nylon that holds a tautline hitch knot fast when under load but lets it slide well when adjusting the tension. The core is spectra that gives great strength for its weight. For tents and tarps it is hard to beat.Kelty's is called Triptease Lightline. It's a gold color that is easily seen in daylight, and it glows brightly in the dark when the light shines on it. I think it's 3 mm, plenty strong. I've been happy with it. I'm sure there are others as well.
Is it strong at least? I'm searching for a thin rope that is strong. Kelty is fine but I don't think it will endure some of the stress I put it through.i've used the micro msr red rope, and i highly suggest avoiding this rope for guy lines. they don't reflect at night despite looking like they would, and they are nearly invisible during the day because they are so thin. i think i'll look into the kelty as well because i want something that people won't trip over day or night.
Ditto on the Nite Ize. Very good for guy lines.I got some Nite Ize Reflective Cord and it looked incredible when walking up on it with a flashlight or headlamp.
I got 50ft for $10 from amazon.