I was searching for a good vocoder for such a long time, the digital ones didn't appeal to me... Then the VC340 came just at the right time for the right price. It is now my main instrument for vocoding but I'm also using other features quite frequently.
This is a pure vintage sounding synth, very warm sounding strings and human voices and a beautiful analog vocoder. Since it resembles the Roland VP-330, it's pretty much hands on, you can see all of your controls without any menus - just the way I like it! Mixing sounds with faders while playing feels very organic and it flows very well.
The built quality is also excellent, the control board is made of metal with sturdy buttons, knobs and faders. The controls generally have a nice feel and they certainly don't feel cheap. The keyboard itself is by far the best one I have in my home studio and it doesn't feel flimsy at all.
Same goes for the ins and outs, it can be used as stereo and it sounds wonderful.
I have no cons whatsoever, well done Behringer! And thanks for bringing this synth back to life. Pure analogue joy!
If you are looking for a very vintage and analog vocoder sound and have no need for million other sterile vocoder options beside it, this would be a good choice!