I see it has a good number of outlets across the UK and thats encouraging.
Getting a product on shelves isn't hard if you offer good terms, eg 'sale or return' and/or offer good margins.
Availability is also no assurance of quality; eg Ashley Isles tools are very rarely seen in shops, but are of excellent quality. Toolstation junk is everywhere.
Hampshire sheen seems to be a great success driven by effective social media promotion.
It may be a great product that works well, but I can't see any advantage in it over existing products for me.