Pearow, I agree for the most part, unless what they say is true. Less core makes room for more of the coating which is where the floatation is. Most of the high dollar lines float higher which makes mending and pickup easier. The problem is that the thinner tip sinks on many lines and that defeats the purpose of a floating line. IF Cortland has improved this I think it is worth the extra money. I don't know that they have. I have just heard the sales pitch for the trout boss, but I plan on trying one.
For the most part I believe that the average fly fisherman will benefit from spending money for the premium lines $70 more so than that on a premium rod $700. That is not to say there are some good lower priced lines. Echo makes a line called the Sphere. My sons and I have fished it all over the mountain west and I can't say anything bad about it. It cost about $50. To answer the original question Ckoen asked, I would buy an Echo 5wt Base$89, echo Solo reel $35, and Sphere trout line $50. This would be an excellent set up and if the 5 cast like the 6 and 8, I would not call it an entry level outfit. Hope this helps.
+1,000 except I would go tfo on the rod. My favorite reel I'm using right now was 16 bucks on clearance. If yo know anything about me I don't just catch fish I push limits and as long as the drag is smooth to handle light lines it money. Have three years on the 16 dollar reel and it's done fantastic. Line though can turn a novice into a pro and a pro into a sniper. This is where you get the most bang for your buck so to say in fly fishing by a long shot and it's not even close. Looking at a new rio line for my eight for chunking the biggest nastiest flys you can think of. But recently got cortland for my four and man I absolutely love it it rolls it mends it shoots and its sensitive to strikes real impressed.