I've used the CT100 for years, both as a very solid cable tester and as a great mount for soldering cables on-the-fly. The CT200 is built to the same indestructible specification and shares lots of the same features, but adds USB, Speakon and Cat5 to that.
The additional functionality means the original idiot-proof 3x3 LED matrix is no longer used, instead using a numerical display and coloured LEDs to describe connected/crossed/open cables.
This makes it a little less intuitive to use, and although it's great for confirming standard cable connections, it displays correctly connected unbalanced jack-jack cables as 'crossed' which is a bit annoying. However the additional cable types available for testing are great, and the further functionality in terms of crossed/open/shorted/phantom on individual LEDs is really useful.
Overall well worth the small additional cost over the CT100.
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