I got one of their low end earbuds when I've lost my stock ones, it sounds not much better than the stock earbuds but the built quality looks good to me, not cheap, if that's the design what you are looking for I would say that the earbuds are well finished and the wooden on-ears also don't look cheap like the beats.
I use them when walking and when I can't use my Grados. They are not that bad in terms of sound, I mean nothing hissy or overly bassy but you can't expect details from an earbud that costs 18 pounds.
I don't get the Marley thing though and I wasn't even aware of the idea behind it when I bought it.