I use them exclusively now. While I have had one anvil "fall out" it was easily found and discarded before inserting into the case. One reloader has had the same problem with primers of main stream manufacturers.
They are a little bigger and need more force to insert. I see that as a plus though.
They work in my tuned revolvers without a hitch. As for my semi-autos, none have lightened triggers and I have never had a FTF with a Wolf primer.
That same thing cannot be said about Winchester in my experience.
Because of my M625JM, which comes with a lightened trigger/hammer fall, I had to switch to Federal primers to have all of them go off. I also installed an extended firing pin in all of my frame based revolvers. When Federals got hard to find locally I decided to do some trial and error testing with Wolf. I got a free supply of only 100 from a friend. I ran them in my firearms that "needed" Federals to fire every time. I didn't have one FTF with the Wolf primers, not one.
I bought 10,000 the first time and the wife bought me some of their small rifle and magnum pistol primers for Christmas.
Couldn't be happier.
Oh, I almost forgot. Chronograph results. When using Wolf primers I get consistent ES and SD numbers. Something that cannot be said when using Federal. I have had to use Winchester for some of my large pistol loads to get consistent numbers over the chronograph. When I use the Wolf magnum primers I get the same kind of results.
OK, OK, the last thing I will mention is the fact I got mine for less than $18/1000. Couple that with all of the other things I have good to say about them and you don't use them because ...............?
FWIW