Let me be clear that I haven't worked with Mathon for twenty odd years and my main motivation for having it is that I used to cycle through the village as a child but I remember it being a much fresher grassy note than Goldings - less of the rounded warmness and more of the light notes - gently floral without being over the top. The cones themselves are a lot paler, I was surprised how green other hops were when I moved out into the wider world.
Digging around there's actually some debate over whether they're that closely related. Goldings appears to be a bud sport off the Cambridge white bine but the evidence for it is scarce. Personally I think Mathon was a local landrace - practically identical plants grow in the woods all round Hereford.
It's a vigorous and quite disease resistant plant - I'd recommend it over some of the newer varieties and think its a good starting point for breeding - ultimately I want to cross it with one of the c types.
Next year I'm happy to take cuttings foc and send them out to people once rooted.