This is not a review, more a comparison. Just listen to the audio samples (German). I have left the recordings completely raw (except for the conversion to the mp3 format, which is unavoidable due to the sheer size of 16-bit WAV files). I am using the MOTU M2 audio interface, and I have set the gain on the MOTU M2 to about 1 o'clock position. I tried to maintain a distance of 15cm for both mics. However, I also tried the close-miking technique, where the distance was about 5cm. A pop filter was also used.
The effect of the vocal head booth for voice recordings (English translation)
For a few months now, Thomann has had what they call a Vocal Head Booth in their lineup, which is quite similar to another model, the Isovox 2 (the successor of the Isovox). As far as I know, these are the only two types of these mini vocal booths available on the market.