Holds tension as well as natural gut. Only problem: depending on the frane it can feel mighty stiff.
I'm having a PSGT strung with Wilson Gut / 4G 125 @ 49/45 to see now that works.
If really seekng a soft co-poly then I agree, MsV Co-Focus is perfect. Nothing more comfortable. Only downside is lower control and lots of power, at least for a poly.
Pure Storm GT mod: 337g, 8.5 HL, SW 328
VS Touch Black/Focus Hex 1.23 @ 58/54