Well Mark, I don't really agree on that. All depends on what you want to do with it...
For example, I have some "fancy, yet expensive" LPG lines to fly in team... (Otherwise everyone is scared of linecut...)
But when I fly alone, I use some "cheap" line. Which is high quality fishing line (made in the same factory as LPG).
I think you need to be a good flier to notice the difference between good lines. (If they are really poor quality , everyone will notice) and then the question is, if your're really good, you'll manage to fly the kite with almost any kind of line... I often fly with my fishing lines when the LPG boys are grounded because lack of wind, to turbulent wind...
It's more about the skills than the lines...
Concerning the handles, unless you go for no snag handles, these are as good as the standard rev ones...
Phil