I dont use any hardware on my tarp or tarp lines! I use an adjustable quick release knot on one end of my tarp and a fixed quick release knot on the other end ( I just copied the Warbonnet setup videos). For the 4 corners I just wrap my line around my msr groundhog a couple times and finish it with a half hitch to secure it.
All those hardware pieces are cool and may help with setup time, but I think its good to know how to tie and use knots. Plus knots are free and you cant loose them!
BTW, ever since Ive bought and used my tarp (over 500+ miles; its probably more but Im being conservative) Ive used braided painters line for the guylines. Ive never has an issue with it failing. Its super cheap and easy to find.