I'm by no means an expert but i have had a few cwc and i used to have a broadarrow some years back (i sold it on eBay and regretted it straight away ) , i couldn't tell any difference in quality apart from the crystal and the dial on the Broadarrow seemed better than the cwc , i can't speak for the Zeno as i have not handled one .I' m sure there will be someone on here with more knowledge .