Graf's is having a sale on these primers. They're used in PPU ammo, and also in many products from major reloaders in the US.
I did a bunch of searching, and other than people not seating them properly, I couldn't find any complaints save for one guy who swore he was having issues ( I don't think he knows ). Other people likened then to most major US primers, save Federal, saying they were 'maybe' a bit harder.
For the $109.99/cs for SPP, and SRP...I bought 5K of the SRP, and a 8 lb jar of H110, also on sale, to use in my M1.
I wish PV had the Ginex primers because their H110 is cheaper. With Graf's flat rate shipping and the savings on the primers I went with them.
HTH.