I think that Amstrad's best selling line was actually the WPC range that used CP/M (8 million vs 3 million for CPC line with their own OS). So having their own

I think that Amstrad's best selling line was actually the WPC range that used CP/M (8 million vs 3 million for CPC line with their own OS). So having their own OS wasn't the deciding factor. I think it's the more commodity nature of PC hardware even compared to CP/M machines that did for them IMHO.