Mike - that's good to hear. I'm hoping some instructions will come in the box - it's cabelas green spot dacron.. if not, will have to just look it up. With a little luck I'll see it today or tomorrow.
No experience w/ the spectra - I've used the classic spiderline & love it for bottom fishing, I think they are pretty equivlant. The fusion is supposed to be a bit safer on guides, but mostly it comes down to price.
Saltwater Fusion costs $16-$18 for 300 yds of 50-80 lb at cabelas. I've yet to see braided that wasn't nearly twice that in cost. I've just got too many reels & too small of a budget. On a aside, it's odd that w/ all of the lines you don't really get a deal buying bulk; I looked into that too, the option of just buying a 1200 yard spool.
The fusion is fairly equivlant in diameter to braids - 80 lb braid is 16 lb mono diameter, 80 lb fusion is 25. As far as stretch - it holds it's own; the downside is in limpness. Fusion acts more like wire, you can bend it and it stays, unless re-formed, braid is totally limp and just goes w/ gravity.
So.. for a casting rod, I'd go braid. These are cod rods & the important thing seems to be a good 400+ ft of fairly thin line w/ low strech. Not quite as good as braid, but it's gotta outfish dacron.