Burnt Orange is BOX Brown with a heavier spring. Personally, I prefer BOX Brown as the tactility is more easily felt. I think in some respects, BOX Brown resembles a buckling-spring.
Burnt Orange feels like a BOX Brown that is going through molasses. At least to me. Others prefer it because of the weight. Again, I think the weight undermines the tactility.
I have used Speed Copper for typing, and it is do-able but weird. First, it feels kind of like how I imagine a Jailhouse Blue would. It wants to click, there's a tactility that kind of feels like it's coming from a click. But it's quiet, there's no click there.
The tactility is very front-loaded. There is a definite tactile ceiling that has to be overcome, and once you do, there's just nothing there. So if you type by getting the feedback right from the top of the switch, you're fine, but otherwise it's like your foot smashing through ice into a lake.
I ended up combining Speed Copper with Pro Purples. I used the Speed Copper for switches where you just want to press a little bit, feel a definite crash through a tactile barrier, and the switch activates. Like on PageDown, where you just want to flex a muscle and the key activates. So I ended up using Speed Copper on some nav keys, arrow keys, and some modifiers. And the alpha keys were Pro Purples. I ended up making a personal typing speed record with this 'ergo' setup.
Speed Copper seems to have been designed as a gaming switch, and it seemed fine for that, using it on gaming keys. But I never ended up going with it for the alphas, as it was just too awkward.