No I haven't heard of them, tho that doesn't mean much. I don't see any of their papers tested in SpectrumViz. I wonder which paper manufacturer(s) their brand uses? And do they use them consistently or frequently change suppliers?
Their website / presence is... minimal. Their website's only banner is about some obscure "award" from 2014. I find almost no mention of their brand online aside from one old fluff/shill piece, a reddit thread, and your current post on DPR lol.
Their FAQ does say they have ICC profiles available on their site, but I can't find any of them. (In any case I always make my own.)
As one example, their "Premium Luster" offering simply says "German Made Premium Base Material" (perhaps implying the resin coating is done elsewhere), and has nearly identical specs to the popular Epson Premium Luster and its twins branded by Canon, HP, etc., yet it costs more.
If it were me I'd take a pass simply because there are other brands/products to choose from that are more widely known (and readily available) at comparable prices or less, without me feeling like I'm taking a gamble on a relatively unknown product.
How did you even stumble upon this brand anyhow?