Flax fiber / Corecork sandwich

Has anyone tried it? 

I have been reading good things about using flax lately. The French brand Notox seems to be getting good results using flax and I think I have seen a few of their boards featuring a corecork deck. Not sure if they have flax underneath?

I have enquired for a few meters of flax from Sicomin but it seems the rpice is 3 times more expensive than my usual 4oz FB. Is it worth the extra spending?