So, i'd tried the bucklos resin pads before and they work pretty good, even more so if you take the price into account. As such, i've started running the bucklos BRP-01 metallic copper pads on my spare bike to test them out, and i just want to say they're the best shimano B01S format pads i've tried so far. i'm running them on a frankenstein setup, with old tektro auriga comp levers and tektro TKD32 calipers. It was always a 2 finger brake with mediocre power (entry level brakes innit), and while i'm probably gonna use 2 fingers sometimes, since the levers are a bit long and 2 fingers sit better on them, it's the first time i've been able to do steep technical trails with only one finger on the brake with no issues. even with a 160mm front rotor, i can lift the rear wheel with 1 finger while sitting with the seat all the way down. They're much better than shimano semi metallics, and they blow the stock tektros out of the water. in terms of bite from cold they're great honestly, even when it's ~10 degrees celsius they brake nicely from cold, and their performance when warmed up is great. Their heat resistance is good too. Also, since they're copper based metallics, i was expecting them to feel a bit ''sandy/rough'', but they feel as smooth as resins, run dead quiet and have great modulation. for 4.01 euros a set, imo they're the best value pads i've ever bought. 10/10 would buy again, i'm gonna buy a shimano XT format copper set to run on my race bike too. next, i'm gonna try their sintered pads on the guinea pig bike when these wear out.
Edit: after testing them in muddy conditions at right above freezing, i've found that they can be a tiny bit noisy when they're wet and under 2-3 degrees celsius. As with any metallic pad, in very cold and wet conditions you do have to build a tiny bit of heat, when you do they stop making noise. This doesn't happen when it's dry, even if they're very cold they bite right away.
TLDR: bucklos gold copper pads are incredible, 10/10 best value pads i've ever bought