I use dream mat and it's very popular over here in the UK because you don't have to classify with it. The smaller mini mat yes you do, down to 1/4 inch max or #8 mesh preferably. I'm not just saying this because I'm friendly with the guy who makes it in both Aus and America, but it really is great matting. Whenever I've used it I've had 100% catch rate, or so I'm guessing. It was set up as a river sluice with a catch bucket for the tailings. After 20 25l buckets there wasn't even a spec of gold in the tailings bucket. What set it apart from the rest of the mats out there is the amount of cons you have to work with afterwards, you are literally left with a handful of material to go through at the end of the day.
I've ripped the riffles and keene matting out of my 52inch folding sluice and replaced them all with normal cell sized dream mat, 10x36 inches. They are bringing out new designs too as we speak, even sizes to fit in big wash plants. My post about it can probably be found in the wrong section here somewhere lol
I haven't personally used it much, but have many friends here that do. If you want more info let me know. Another friend of mine has just got the go ahead to start making it over here in Europe, so that's all over the world that can have easy access to it.
Truth be told, a lot of people are finding it hard to accept it because of its design, but when it works so well you can't really complain.