My vision is terrible. I can't see my front sight worth squat with my regular glasses using progressive lenses. I have special shooting glasses that make iron sights a joy to use but they're a lost cause with my regular glasses.
I can shoot a red dot fine with my regular glasses but plain irons are a fuzzy mess. I wouldn't expect the XS big dot sights to be faster. I would expect them to be less accurate. But I may experiment with them in the future simply because I can actually see them.
Either that or I need to consider switching to red dots on my SD handguns, a step I really don't want to take since the training (or, more accurately, re-training) required is more of an effort that I can put forth right now.
I agree with Ben. I really want to give those puppy's a tryout. If I am sitting with my grandkids in a restaurant and the SHTF I'd like to think I could do more then just shield them with my body. If the XS BIG DOT can give me a half second quicker reaction, that might make a difference.