I've experimented with different poly setups for years, and liked many of them but dang they lose their mojo so fast. This Luxilon natural gut surprised me. Long lasting, great tension maintenance, better than anticipated control, easy access to power, and surprising amount of spin. I strung this gut in the mains and paired it with RPB blast in the crosses. Yes it's expensive but it lasts far longer than poly. My new go-to.