Do Nordost QX4 purifiers worK? Upscale Audio is $1.649 vs. $2,700 so looks like a good buy

What do you think of the Nordost QX4 Power Purifier? What difference(s) did it make to your system?   Were they "big" or "small" differences? Some have complained here that this item is a relatively few electronics in a heavy aluminum box at a crazy high price.  Upscale Audio has them new for $1,649 so that's a +$1,000 saving off $2,700.  Thank you in advance for your candid thoughts - they are much appreciated! :-)
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Looks like its being discontinued hence, the closeout "bargain" price? 

Nordost is one of the more polarizing brands. I use Nordost cables. You probably don't want to see  inside of the box. Likely disappointing if you see value as lot of parts inside a box.

Definitely a try it for yourself device. I couldn't hear "improvements" while others claimed they could, in a demo.
It's lipstick on a pig. 🐖🐷🐽
Two responses from folks who probably had no direct experience with QX4. Even as a stand-alone component, QX4 is worth checking out. I know I can’t imagine my system without it.
At $1649, it’s a bargain for what it does!
Upscale audio gives on real deals there turkeys.