Do you have a YouTube channel? You're the type of reviewer I look for; checking out stuff outside the norm.I review quite a few products here in Hawaii. I'm always curious to check out something new or simply different from what many others are using. I've ordered a set of red label MTX pads (they're quite pricey) but if it's really that good, it'll be a worthwhile investment and I'll provide a review with my findings here. It will take a while since I tend to conduct testing over a few months before submitting a review.
I'm a long-time Shimano user that's been using SRAM Code RSC's for a few years and have a Dominion A4 set coming in to test. For years I've always known that you can have the state of the art braking system but when coupled with mediocre pads, you're not getting the best out of any brake system.
Here's just a few of my experiences with some a few of the pads I've tried.
SRAM Resin - These actually have a nice feel under partial braking, they perform better under the area below full and middle-zone braking power than SRAM Sintered giving you a little more power sooner. Under hard or extended DH runs, they will overheat and glaze rotors and are not particularly reliable (inconsistent) and noisy when wet.
SRAM Sintered - These are generally like Shimano Sintered pads. They're excellent at full braking power so these are the pads to get if you need peak braking power. These pads howl, they are the worst when it comes to noise when wet or contaminated. The issue with these pads are they wear out rotors faster than their organic counterparts due to the harder pad materials (metal). They don't provide much power when the brakes are cold (or cool) and requires higher temperatures to notice more power under partial or maximum braking power. I would only use these kinds of pads if I'm ever going to bomb down a tall mountain straight down where I have to be on the brakes almost full time, which is never the case. These pads are horrible when wet and the difference between dry and wet braking distance at full power is huge (bad).
Uberbike Race Matrix - These were recommended to me by UK riders and it seems to be a very popular brand. I'm not entirely sure what's in these pads but it is some sort of Kevlar blend. As with many Kevlar pads, they make a crunching, plastic-scraping sound when used. They perform very good in the dry, very consistent and strong feel, but they can make some noise when wet but not to the extent of Sintered pads. The issue I had was simply getting used to the sound. The brakes will work just fine but for some reason my ears are telling me something unusual is going on. This was the first real upgrade I would use in place of the above two.
Gorilla Ceramic Nanotech - I came across these pads when I was in search of ceramic pads. For some reason these pads took longer to bed in than I expected, even after 15 cycles of bedding runs, I didn't notice much improvement. I took these to the trails and went on a decent that spanned a few miles to bed them in. Mid-way, they finally felt a lot better and when I shuttled back up to try a real run, I noticed they were similar to the UB-RM pads above but with a different (more subtle, quiet) sound. When wet, these will make a small amount of sound but nothing major. Performance is similar to the pad above. I'm of the opinion that these are some sort of hard ceramic compound. What's nice about ceramic-based pads is they leave less black colored brake dust (because the dust is actually white).
Discobrakes Ceramic Pro - I was skeptical because these are priced really cheap. This is their softer ceramic compound. I was actually surprised at how good these pads are. This is the first pad I've used that exceled at partial, mid and full braking power and in my tests, they were better than all the pads above. Braking distance dry vs wet was around 1 feet, and they were completely silent despite drowning my calipers with water. IMHO these are the pads to beat as they cover all the areas. They're cheap, they're silent, and they perform negligibly close wet or dry. They're my current pad of choice and I haven't found anything that comes close. Like Gorilla, these pads make the appearance of having less brake dust but the dust is white and less noticeable. The only flaw is, these pads are almost always out of stock, and when they are, people buy them out in bulk. Of all the pads, these pads are the most powerful and have the shortest braking distance. Disco does state that life expectancy is shorter than their other pads but my testing shows they tend to wear no worse than any other non-organic pad material unless you have undersized rotors which will wear out pads faster than those using larger rotors.
MTX Red Label pads are something I'm looking forward to testing. Discobrakes' Ceramic Pro compound is very hard to beat, they already excel at the sound, wet/dry performance areas and the price. Even if the MTX pads perform identically the same to the Discobrakes Ceramic Pro, in the end the price will determine whether $32.99 for a set of MTX pads over $12.19 USD for Discobrakes is a reason to switch. Disco doesn't make Ceramic Pro for every brake system out there and in the end that may be the only reason to use MTX should you be in the search for ceramic-based pads.