I own a Sylk, and I use it mostly in flatter, spring-creek style situations, especially during winter. It has very little memory and the color is ideal for technical fishing, but I haven’t latched on to the thing as an everyday line.
The diameter is smaller (fishes nice in the wind), but it also doesn’t float as well as the newer “fat” lines. On flatter water, flotation isn’t a problem, but on rougher stuff, it does matter.
I don’t know how real the “small guides” problem is. It’s true that silk lines used to be the norm, but I fish a bunch of Phillipsons and a few Grangers with standard 444 lines without noticing a problem.
I haven’t experienced it, but a few people have complained of the line getting “sticky” on them in hotter weather.
I have no idea what that means, but there it is.
In short, I think the Sylk is an interesting line and useful in some situations, but not my first choice for an all-arounder.
Some caneheads really like them, probably due to their extremely limber nature.
Tight lines,
TC