Metafields Guru

We've been using this for some time, and were pleased with the functionality. They they added 'SETS', and that is an awesome add on, changes the utility from good to really good. Then they recently add the excel-like editor (like the bulk editor), and it's even better. Really awesome. Sets allows us to group a bundle of metafields and access them in one screen for each product. Excel-ish editor further allows us to edit the content in table format, so copy-paste is super quick in a single screen - a real time saver for a bulk job. That there has been this much innovation in a relatively short period of time is evidence of a dev team that gives a damn. Their support, while not often needed, is as excellent as you might expect. Strongly recommend.