Inficon whisper ultrasonic leak detector

Has anyone used one of these ultrasonic leak detectors? If so i'd like to hear about your experiences.

http://www.inficonultrasonicleakdetectors.com/en/whisperultrasonicleakdetector.html

I have used an ultrasonic leak detector ( not the same make/model) to locate leaks in a compressed air system in a factory. I would understate thae results by calling them phenominal! I was picking up leaks from 20' away and zooming in on them right away. I kept 2 guys busy documenting each repair needed. The end result was that they did not need the larger compressor they though they needed and the tool paid for itself the first time it was used.