50' hank of 2mm Glowire is $13.50. However, if you use a 30' 1-piece ridge line, that leaves only 5' for each corner so you might consider getting 2 hanks if you want longer corner guys, which it's likely you will for using porch mode. Glowire is a bit heavier than zing-it but is SO MUCH more knot friendly and tangle resistant and better handling that it is totally worth it.
If you're using Ti shepherd hooks, it's very easy to slide the clove hitch around the hook end to release. I haven't done it, but I could imagine a zing-it clove hitch very hard to untie. It is also possible to tie a slipped clove hitch, although I find it unnecessary with shepherd hooks.
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