No doubt, Meprolight sights are the best. That said, I found out the hard way that Bersa has used different sight designs for the Thunder .380 and Meprolight only makes one of them. There are fixed dovetail rear sights and set screw style slide sights. If you have the dovetail these won't work. If you're like me and open the package and/or wait more than 30 days to find out you're screwed and either toss $80 sights in the garbage or throw good money after bad and replace the slide, neither of which are good solutions especially with a cheap gun.
Pros: Excellent sights, but only if they fit your gun
Cons: Bersa Thunder .380 sights are not all the same
This review was written in the old system and had content requirements that are different than reviews written today.