I purchased the Mat based on the positive reviews I read here and in other places and also on the low cost.
The online ordering process was textbook: order placed easily, confirmation received, shipping notice received and 3 day delivery to Philadelphia.
From the beginning, I've been pleasantly surprised at how much difference it makes.
First of all, my system:
Rotel CDP 855
NAD T-163 Pre/Pro - Set to Stereo, Direct (flat)
Emotiva UPA2 Amplifier
Klipsch KG-4
Room: 9 x 18 x 9
Note: as has been mentioned, putting the mat on when the CD is still in the case makes it easy to place properly.
On the first track of the soundtrack of "Cinema Paradiso", the stage seemed to gain significantly in depth - which seems to be a consistent characteristic of the mat. In addition, the presentation of the individual instruments is significantly improved - I can simply hear more of what Morricone puts into this spare arrangement.
I thought I knew the Faure Requiem pretty well. With the Mat, it became clear that I had been missing a lot of the complimentary figures in the voice lines behind the soloist.
In the Rachmaninoff 2nd Symphony, 3rd Movement, the Mat made it easier to follow the accompaniment behind the clarinet solo, making the patterns much clearer.
In "Tap Your Troubles Away" from the original cast recording of "Mack and Mabel", the sound of the tapping sounded more like it was live, due to the presentation of the low frequencies that had previouly been missing> In addition, the orchestration was more coherent and more enjoyable.
I found the same sorts of improvement in just about everything I have listened to so far.
Given the cost, I don't know of anything I've done to my system over the years that has even approached the value this thing delivers.
Based on what I've heard so far, I can easily add my strong endorsement to the others here.