I have several spools of fireline on my bench untouched. I'm stubborn but your report makes me want to try them out.

One concern not address is the visibility of the fireline or super line. I think fish can see it better than mono. What are your thought on that?

Second, If I can't find your wonderful article in F&S a couple months ago, what are your knots of choice for super lines.

One thing that keeps me from using super lines is the fact that they do not stretch. I like the stretch that mono gives on a hard fighting fish.

Another thing(yea, I ramble) How do you know when to replace superlines. My son uses fireline and it appears all frayed. Is it still good? Is it true that some super lines may cut some guides?

All of these things have kept me from going over to the dark side when it comes to super lines. I thought maybe they would be a passing fad but it appears they are here to stay.

I use both types of line. My main issue with superlines is the high visibility of them in clear water so a flourocarbon or mono leader is needed.I generally use mono for fishing soft plastics(gulp mostly) because if you get hung on a log the line always breaks at the back to back uni knot and I hate having to tie two knots every time I get an get a hang. Also mono is cheap and I change line frequently. 1/4lb spools of ANDE mono can be had for what 100 yards of superline costs.
When fishing with baits such as mirro-lures and spinnerbait type lures for speckled trout and red drum is usually go superline with a leader depending on water clarity. And for surf fishing I go superlines all the time for the added capacity, greater casting distance, and superb sensitivity in the waves.

I've been using it for the last ten years or so. I like having a thin strong line that doesn't twist. If you're snagging humpies while trying to catch silvers you need a strong line to horse the humpies with and yet a thin line to not inhibit lure action. It is a real frustration fighter.

I've used a lot of both, and really, it doesn't make that much difference to me. I just fish.

Firline is all is use my spinning reels except my ultralight. I use the 14 lb except for the rods I use for larger fish and thick cover where I use 20 lb. I always use a 4-5' fluorocarbon leader (20lb) with the uni-knots you describe.
I agree with the post that said it is easier to untangle with the caveat that the tangle is not pulled tight. When that happens you are done and might as well cut and retie. I have also heard from walleye fisherman that it pulls hooks when trolling. I almost never troll so I can't speak from experience there.
Mine does fray and I cut off the last 6 feet every couple of weeks, that seems to help.
I have never broken Fireline, the uni-knot on the fluorocarbon side has given out several times but I think that was overuse and/or operator error in tying the knot. Another thing to be careful of is that the stuff will cut you if you are not careful tying or trying to free lures. I use the boat towel or a glove to cinch down knots and always when trying to pull a lure free.
Otherwise the stuff is awesome, I have watched a northern steam throught the weeds and you could tell where he was by the cut vegetation floating to the surface. It is super-sensitive and super strong. It is worth every penny in my opinion. Check it out if you haven't already.

My new wife had never fished before. With the new anti reverse reels, 20 lb test fireline and a weedless frog, she can catch fish. Her casting is not accurate but it doesn't matter. The fish bite, she can't get hung up, and the line won't break. I cheat because I have a private beaver pond that only I and the ospreys and eagles fish, but its nice. The technology that we have today is amazing. Super braids are a wonder tool. They will cut you though, be wary.

I have yet to make the change really... I have one reel that has some braid on it but I treat it like the "red-headed step child" of the bunch and it does not see much action. I usually, more often than none, fish with the reels with mono on them. But after reading this, I am kind of itching to take the red headed step child out fishing...