According to Magura, they specify brake pads with no more than 30% metal, which in the Cooma range means their organic pad EX Plus range.
They also do a Ceramic pad for about AU$1.00 more for four. What is the thinking on Ceramic pads? An even better option than, say, the EX Plus pads?
Being in Australia ... the solar works quite well. DCRainmaker and Bikepacking.com seem positive about it as well but then they do not have Scotland's weather :)