I just started using the Nite-Ize fig 9's for the ridge line only, and so far they are working out well. You still have to know some other traditional tie-off method in case you loose them.
As far as guyline management, I'd like to see small pockets where you can tuck each line away where it attaches to the tarp. I've dreamed of this every time the lines get tangled unwrapping it, the was pleasantly surprised when I found my HH Hex tarp has excellent line pockets. THIS SHOULD BE STANDARD ON ALL TARPS.
This was after a wet 16 inch snowload and all the lines held well. I've now slept out more than 12 days this month. Last night it only got to 0°F, and lowest so far -4°. It's going to be fun trying to get these stakes out!