The Matik weighs in at 276g in comparison to the Eddy's 360g and overall it feels like a more compact device. In terms of rope soloing it's not something that I personally used it for, hence wouldn't really like to comment.
Agreed on the 'soft catch' point. I had a friend belaying me with one of these recently and if he didn't add his own dynamism (is that a word?) it wasn't that soft a catch. For a proper soft catch you're still better off with a belayer thats substantially lighter than you!
Is it not the case with a regular (grabby, something along Pivot/ATC/Reverso) belay plate though? If your belayer is heavy and doesn't give you much dynamic in the belay, you would still suffer? Maybe not such a big deal on trad with half ropes as the falls can be a little bit longer than the falls in sport climbing. I don't fall too much on trad gear though, less than 5 times this year .