I've been lurking on here for quite a while, but haven't said much of anything. I thought I'd just add my experience here. I used Berkley 100% on spinning all last year with no problems at all. I've also used InvisX which handles very well, maybe even better. Only thing is, it seemed to me to have more stretch, less sensitivity, and less abrasion resistance than the Berkley product. Just my experience, not any scientific study.