I recently received my XS Big Dots in the mail, Lima was able to mount the rear on Thursday. I got the front sight mounted today and went to the range.
This is my second target with the dots, the manufacturer states that you pretty much just "Dot the I" but it's not quite that easy, there is a little fine tuning of sight alignment that needs to be done, so the first target was a test run, once I figured out how they need to line up the results were favorable.
I only shot at distances of 7-10 yards for part 1, unfortunately by the end of the first 70 rounds the rear sight was coming loose, I don't think Lima used the thread lock compound that came with the sights, but that will soon be taken care of.
As you can see from the picture above, they work pretty well.
They align very quickly on the follow up shots.
Once I get the threads Loctited down I'll go out to further distances and see how they fare.
The only problem I have is that the Big Dot is taller than the factory sight and my OWB belt holster's sight channel is too shallow, but I think I can manage to make it deeper.