I bought a pair of used Bab Pure Storm Tours, and they came strung with Kirschbaum Proline II crossed with Pro Supex Spiralflex. Great feeling string - slightly crisper than Big Ace and still arm friendly. The only issue is that after 7 hours of heavy hitting, it seem to have lost a fair amount of tension. Is there another poly out there with similar feel (crisp, but not harsh) that holds tension a bit better? Big Ace would be a candidate, but it's a bit more muted, and if I can stay with the crisp feel, it'd make me a very happy person.