Experience with HFTs

I used to have so many HFT’s, probably 30+ and many more of my DIY creations.

Until I found the Stillpoints Aperture ll’s. They make the room sound so much more real, the HFT’s sound fake when compared. Though a lot more money, I now have 8 of them. And, I also have 20" ASC tube traps in the 4 corners.

I sold off all of my HFT’s.

ozzy

I have 18 HFT's.  Two are missing or fell off and are lost.   My wife hates them and everyone that comes to our house tries to take them off the walls.  I can say that I have not followed the exact guidelines due to the room structure.  I probably have 11 on the ceiling beams.  I am not putting them on my speakers...sorry, I do not want even a smudge of putty on them.  I am also in the process of adding Vicoustic Cinema round absorption panels.  I have the Townshend podiums and Shuman Resonators.  

In my case, the Shuman Resonators have no impact on my music or sleeping habits.  Townshend Podiums a slight improvement in the soundstage.  HFT's - can't really say they help or hurt.  Please don't say I did not follow the exact placement locations as instructed by SR.  Someone would have to prove to me scientifically that those locations are the only place they can be.  Now, if the HFT's came in white, then I might be able to follow the guidelines.  Fuses are a definite impact on my music.  At this point I have so many tweaks I don't know which ones work and which ones don't.  

I lost one, the housekeeper says the Kirby “ ate it “. I did notice that ever since our electrical bill is lower, refrigerator runs colder, etc…

Seriously, better than an RPG diffuser ?

I use 8 HFT’s in my room.
At some point, I’ll probably add another set.
They’re expensive, but they do what they say they do.
I also use acoustic treatments.

Actually, I heard greater effect with HFT vs. RPG diffuser. What I don't like about HFT close to speaker is it alters tonality/timbre far more than RPG. Synergistic admits as much since they offer another HFT thingie they claim warmer sounding. Also, HFT have excessive reflective effect for me, bounce sound waves around room in excessively uncontrolled manner vs. RPG, RPG  has slight absorptive effect. Plus, I cut the RPG's into fours and spread them around my room, one large one near speakers allows unnatural effect for me as well. I do like the HFT behind my listening position, not affecting tonality/timbre here nearly as much, not close to speakers. And I did try multiples of the six HFT I presently use, many different positions, did not care for effect anywhere else.
What I've found over many years of experimenting with room treatments is there is a point where you can have too much. I've been there, done that, backed off to point of too little, back up to just right. I personally try to get by with minimal amount, artificial manipulation of sound staging and imaging just sounds artificial to me. I want proper ratio of width, height and depth, most importantly I want decays and attacks to sound like they sound in real life. Some amount of natural room sound is best for me.