Many people have purchased & use them with glowing reports. I have several, and I really like the different head design, to where removing one is easier than the factory ones. Plus,, for heavy recoiling handguns,, the screw lock helps stop base pin pull causing binding.
The biggest discussions on their good or bad potential is the way you look at cylinder alignment.
Some feel that due to tighter tolerances,, you can get less lateral play,, and better alignment of the cylinder to bore. Others worry that due to the gun's tolerances,, where a little lateral play allows a bullet to align itself is necessary, that a Belt Mtn pin MAY not allow enough lateral play for the alignment.
But many people feel the Belt Mtn pins are perfect.
I always suggest this;
Get serious about shooting your gun with the factory base pin. Then swap out the factory one with a Belt Mtn one, and test. Only YOUR gun in YOUR hands can tell you if it's an improvement or not.
But,, I do enjoy mine & haven't had any issues using them. I like the "Keith" style heads.