I've got these on the way

https://www.amazon.co.uk/gp/product/B017TZLYC6/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1

which looks similar to this set of copic markers

https://www.amazon.co.uk/Sketch-12pc-Cool-Copic-Marking-x/dp/B0030MJ218/ref=sr_1_13?s=officeproduct&ie=UTF8&qid=1499368853&sr=1-13&keywords=copic+grey

although the BrushMarkers are 6 cool greys and 6 warm greys.

I'll let you know my thoughts on them for sure