First some engineering background:
1) The AC line is supposed to deliver a single-frequency sine wave (60 Hz in the US, 50 Hz in Europe). It is supposed to contain NO harmonics (unless you count the 60 Hz first harmonic). Any harmonics that are present are BAD - they occur because of waveform distortion and other forms of electronic interference with the power system.
2) The power supply in each piece of equipment then converts this AC into DC appropriate for the particular device. In the process removing ANY noise or harmonics present (as well as the primary frequency). Some power supplies do a better job of this than others.
3) A power conditioner helps the power supply do its job by preventing at least some of the noise in the line from reaching the power supply. If the power supply were really well designed then the power conditioner would be unnecessary - but this is the real world.
Anyone who PASSED their engineering courses knows this.
From this it is obvious that any claim of a device "replacing missing harmonics" in the power line is total nonsense.
As for their other product claims...... most of them are "engineering doubletalk" or worse. They have used the word "skew" in a new and creative fashion (while it can describe types of signal inaccuracies, usually involving videotape travel, they use it as the name of some new distortion that only they seem to recognize). Nobody I know with engineering background has any idea what "aligning the audio magnetic envelope" might mean - but it sure sounds cool. Same for a "20-50% improvement in sonics". Their "technical descriptions" are relatively pure nonsense.
Do some of their other products make the music sound better?
There have been many products in the past that added specific types of distortion to music to make it sound "better" to some people (remember the Aphex Aural Exciter).
Since there is no relaible way to remove distortion from a signal after the fact, this MUST be what their TriPhazer products do (if they do, indeed, do anything). If you like the way their gadgets make your music sounds, then you should probably buy them - just make sure that you really feel the change they make IS an improvement. Personally I prefer to AVOID distortion as much as possible so I have no interest in them.
It's even possible that some of their products do something useful..... but the technical descriptions on their Web site are the worst pseudo-scientific drivel I have seen in a while...