MDP Photo Slates

[Bob700]

Hi is any encountered any problem with MDP photo slates, I've been using them for a couple of years with no problems, my settings are fine but some of them come out faded, I recently bought a box from them and I realise slate is not perfect at the edges but most of the ones I bought were really rough I'm wondering in their supplier is getting less fussy and maybe the coating is not as good as it should be........can anyone recommend a supplier at the same or near their price, I'd like to try slates from another company
Thanks