I'm running an American Defense 1.93" with our 1-6x FFP Raptor. In the prone at high magnification it's a bit slower because there's more wiggle room with my face, I'm not smooshing my jaw against the stock so hard that it lands in the same place immediately every time. So I wouldn't recommend it with anything that has a picky eyebox if you want to do prone shooting.
At 1x from the low ready or high ready, etc., it is great. I don't have to "turtle" my head at all, I just hold my head straight up, bring the the rifle up and POP my reticle appears with both eyes open just like a read dot. It's easier to be consistent this way, instead of moving two things (gun and my face) I just move one of them, so I've cut my potential variables in half there. I think it's definitely faster when at 1x magnification and standing unsupported. It pairs marvelously with a FFP low power variable, I personally lose almost no time compared to a red dot (likely because the hardware isn't the limiting factor, I am).
For better or for worse, this is what my shooting position looks like with the high mount. Some competition shooters will point out ten things I'm doing wrong here but for the level of shooter I am, this is what a 1.93" looks like in action.