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Many professional type designers as well as big names in the font industry use Glyphs. It has all features that professional font designers need, such as smart components, interpolation, kerning, hinting, even beta support for variable fonts.
Pro Good support
There is a support forum on the website and the developers are very responsive. Cutting edge updates are released frequently. Support questions are often answered within hours and if relevant, often followed up with an updated version of the app.
Pro Very good documentation
An extensive PDF manual can be downloaded from the website. In addition there are in-depth articles on the website covering a large number of subjects.
Pro Text based font files
Fonts are stored as a plain text file that can easily be put in a source control system like Git or Mercurial.
Pro Discounted price
If you are a student, teacher or school you can get discounted licenses. If you don't need all features of the full Glyphs version, there is also a cheaper ‘Glyphs Mini’ available.
Pro iOS viewer app
There is a Glyphs Viewer app for iOS which allows you to use your iPhone or iPad as a second preview screen via WiFi.
Pro Automatic functions
A lot of things Glyphs does automatically for you if you stick to its rules, like OpenType feature code, building accented letters based on position anchors, ...
Pro Language support
Glyphs contains character sets for nearly all languages. If you're not sure what characters are required e.g. for Arabic, Glyphs can tell you the requirements.
Pro Plugin support
There are a large number of useful and free plugins from third party developers available through the built-in plugin manager. There are also some commercial plugins.
Con macOS only
There is no version for other operating systems.
Con Glyphs dictates your workflow
You should stick to the principles that Glyphs sets for you. For example, if you try to use your own glyph names, all the automatic features won't work correctly.
Con Cutting edge versions sometimes unreliable
You can opt in to receive cutting edge updates, which are released every couple of days. These contain new features, but often introduce new bugs or change your data without being aware of it. Better stay with the official stable releases.