I recently purchased a set of these for my Glock 34, to try a different sight from the existing 10-8 performance set.
The 10-8's had a suggested .156 rear, which worked really well, but was wide in the rear. I used a green fiber optic with the 10-8's as opposed to the standard red, as my eyes picked it up better than red.
The installation was standard Glock, with a minimal amount of fitting required to the dovetail on the sight...actually, just a few passes to both surfaces with a diamond triangle file did the trick. Front install was pure Glock.
Initial impressions at the range were good;
there was a whole lot less air between the front and rear sights in the sight picture. My feeble brain wanted to drop the front into the "Y", but after about 1 1/2 mags, I figured out that the sight picture is the same as any sight....even posts.
At 7 yards on 3x5 cards, one hole drills were even easier than with the 10-8. Controlled pairs on plates at 15 were where ever I wanted them to go.
I still found that for my eyes, a red fiber just doesn't work. I have swapped out to a green FO, thanks to Doublestack45, and I can see the front sight just as I have with the 10-8's.
I feel I still have many hours of drills to go with them to get as comfortable as with the 10-8's, but I think it is a more 'precise' sight picture.
I put the 10-8 setup on the Glock 19, my carry gun, where they are working just fine.