I have a set of the 24/7 model on my PT845. They work great. I've read in someplaces that night sights can be too bright in the dark and obscure or blur your sight picture. I don't have any issues like that with the Meprolights. The only problem I has was stripping out my front sight screw hex head. Decided to cut my losses and let a gunsmith do it.
I found a sale, a while ago, at OpticsPlanet. Got them for my PT1911(& Ruger SR9C), and $20 for 'smith to install. Very happy!! I'll probably try FO or TFO on the next ones. I have TFO's on the Sig P238, SWEET!!!
If memory serves me correctly the sights are made in Israel, and these days they are imported by Kimber. They of course are more expensive on the Kimber site. As to the quality, they have always been known as being a bit better than their competitors. They are brighter and last longer too.