Overall, these two clients are useful apps but are limited to only playing MIDI and audio CD files. If your needs in these two areas tend to be high, you'll likely find that MidiGate and CD Gate are valuable clients, but if you're not a serious Midi/audio CD user, you'll probably prefer a client that plays a more extensive variety of audio files.
Additionally, many of the newer audio CD players offer more advanced features like Windows traybar support, Internet CD Database (CDDB) support, and support for playing newer audio formats like MP3 files. For these reasons, it's tough to recommend CD Gate when competing releases offer so many more features and, in some cases (CDValet, for example), a less expensive price tag.
Pros: Plays your favorite Midi/audio CD files, functions great as a browser helper app
Cons: Competing clients are more advanced and/or less expensive, plays CD/Midi files only, severely dated interface and feature-set, far too expensive for its limited features and functionality
