I actually just took delivery of one of these that is to be my Christmas present from my wife. Naturally, I had to check it for function prior to wrapping it up.
I did not feed it any .454, but it went through approximately 50 .45 LC's without a hitch, both 250 grain LRN and 200 grain LSWC. The only issue I had was a very strong ejector spring. I haven't decided yet whether to trim it down or let it wear in.