I hear good things about Metrics Machine, but the product description suggests that it mostly does the same things FL's kerning tools do, though with a better UI. (Though scaling caps kerning for small caps is a very neat trick.) Who out there is using Metrics Machine? I'm sure anything Tal Leming built is a good tool, but do you find it worth the money? Is it still worth it if you're migrating to Glyphs or Robofont?