I have a bit of experience with, and extensive exposure to guns (many were/are Best SLE's) with Miller triggers....

I was in that old shop many years ago , and can attest to the unique character of the Miller 'smiths, pretty much one of a kind guys.....

I always supposed that considering the number of Best,and lesser SLE's that they installed their trigger in, they must have had a 55 gallon barrel full of intercepting sears laying out back somewhere.....

The Miller design, when installed on a Sidelock gun required the removal of the intercepting sears on the locks...... Never was detrimental to performance in my memory, just a quirk in the design.....I asked Howard about it once and he gave me an explanation in few words that he felt covered the question..... 'nuff said.....

Among competition guns of a generation ago the Miller was common...... A gun I owned that resides in the ATA Hall of Fame, a Purdey Pigeon gun was used "extensively" by a Flyer shooting notable for over 25 years, suffered only one episode of balky service in that entire time....

The problem occurred when an " armourer" (not gunsmith) in the armoury in the Barcelona club misunderstood the request for daily cleaning, to include deep cleaning ( removal of the locks etc.)

Fortunately a bit of work in the hotel room in Madrid by another flyer notable put it right there after.

The owner continued on for 20 + more years without incident until retiring it for a more modern gun with a trigger he considered superior.

I feel the presence of a Miller a plus in most cases, fully understanding the prejudices of those who decry any alteration to a fine gun.... But.... competitive shooters and collectors do think along somewhat different lines....