I use a Trinnov Altitude 16 in my theater. I am satisfied with the unit and believe that it provides high quality, many useful features and some innovative, unique room calibration features. I had my theater professionally calibrated.
But phrases like "night and day difference" and "destroys the competition" are excessive hyperbole. A well mastered recording/movie, high quality, well-positioned speakers and reasonable room acoustics are far, far more influential than devices in the electronics chain. It's not uncommon for a room to induce 10-20 dB peaks and nulls; Speakers often exhibit 1% distortion and all sorts of dispersion irregularities. By contrast, modern electronics (preprocessors, dacs, amplifiers) are audibly transparent.
I like and recommend the Trinnov. I'd buy it again. But it isn't a magic bullet.
A number of years back, I participated in blind testing between a number of AVRs and pre-pros (Marantz 8802a, Marantz 7704, Denon 4300 and others). We had the opportunity to instantly A/B between any two devices at a time. In stereo direct mode with no processing, I could not hear any difference between any no matter how hard I tried. I was shocked at the time. I'm sure if I added the Trinnov to the mix without room correction, I wouldn't be able to hear the difference now either.
However, for me, everything changed with Audyssey vs. the Trinnov Optimizer. I had done everything I could possibly do with the Audyssey setup - fully treated room, used MSO, spent hours and hours with REW, used Denon app, etc. Yet when I used the Trinnov Optimizer without any tweaking, I had substantially (I'm trying here to not use more superlative adjectives) better stereo and ATMOS surround sound. The magnitude of improvement, again - to me, was very significant and noticeable with only the pre-pro having been changed within the system.
I had a full, professional calibration done recently. Unfortunately, I didn't save my original non-tweaked, optimizer only presets to compare to the professional calibration. Audio memory is tough with that one but I think the pro calibration squeezed a bit more cohesiveness but I don't recall it as being a significant improvement.
I'd love to do a blind A/B between a DIRAC based system and the Optimizer with an ATMOS setup with neither having been tweaked and using only the standard calibration performed. Now that would be fabulous.
All that being said, I can't imagine my room sounding better. I often have to check the input/output VU meters for each channel to confirm I'm listening to music in stereo vs. upmix to a multi-channel format. There is often, but not always, a three-dimensional effect with stereo music that I had never previously experienced in my room. The cohesion of the ATMOS sound bubble is substantially improved as well.
I wouldn't expect the Trinnov to be a miracle worker in an untreated room (though perhaps it is) but it made a very substantial difference in my well treated room.