Gravel Creek Leader spools

[Broadwing]

When stopping buy my fly shop today, I found a new leader on a spool. Does anyone have any experience with these leaders?
They seem to be affordable, and the Mou i imagine is Mono and the Eidolon is Flouro, at less than four dollars for Mou and 7.25 for Eidolon, they seem affordable. Thoughts?

[CO Flyguy]

I know Loon has started offering the same kind of thing. I have some on order for the guide business, but have not recieved them yet.

I can not imagine that Loon would distribute anything that wasn't a good product, so maybe this is a good idea.

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Ken