I've been using Spectra lines exclusively, from Combat down to 1/2A, for the last three years. What clinched it was finally being able to fly the pattern (with my raggedy planes) because of the lightness of the lines. The tip weight was now adaquate, the engines didn't have to work as hard, tension on the overheads, and you can step and trip on them all day long with no damage. They are draggy, but at my skill level, it doesn't matter.
I did experience both 65# test lines breaking on my Taurus due to abrasion against the rusty music wire leadout quides. I buried that report over in Old Time Stunt.
Spectra is currently AMA legal in Combat, sport and demo flying. Legalization for all C/L events was rejectected in the last rules cycle without any explanation from the NO's except for a detailed account of his vote by Keith Trostle here on the forum. Perhaps if we contact the C/L board members who voted it down and find out why, those issues could addressed. Can't see that anything has changed to think that it will pass on the next cycle if submitted.
Ara