Its funny how many things you can do with this great little synth.
There's not much to say on what you should expect from an analog synth, but what the CAT does, is that with its design it allows more posibilities and ways to use each section.
Take the oscillators for example. You can feed them to each other, you can sync them, or use them to control the filter or use them as S+H source (VCO1). And keep in mind that each one has a sub oscillator and a waveform mixer. Or the envelopes, which can be fed to a number of sources simultaneously.
One thing that puzzles me however is the oscillator sync. It sounds a bit "broken" sometimes. I'm not sure if this is Behringer's fault, or the original design. Also one thing you should take in account with Behringer synths is the envelope curve steepness. You can't fine tune it easily for short lengths.
Overall, the synth maybe a bit complicated for a novice user, but I would recommend it nevertheless, because of the wide range of options it offers.