i'd rather just spool up with the braid and tie on a leader length of the 15lb fluoroclear when you wanted to use it. the practicality of the 2 spools seems minimal to me. i have spare spools for both spinning and casting reels, all of which are sitting in a box in my garage, never really used, ever. honestly, i'd also be a little concerned about somehow damaging the spare spool when not in use and then it would really be useless, sitting in a box, in my garage....