This string solves an issue the regular Gut-a-Like had for me.
The regular Gut-a-Like strings are good strings, but the regular Gut-a-Like E-string is quite loose, which means limited note sustain and the occasional over-vibrating and colliding with the A-string (=awful sound).
I caught myself deliberately avoiding the E-string because of this, but with this copper winded E, I can finally enjoy the long sustain and good tension that avoids clipping into the A-string.
My advise is to stay clear from the Gut-a-Like and pay the extra and go for the Deluxe string set, which comes with a copper winded E and A.
Tip: this string is equal to the Gut-a-Like Twister Copper E String.