All my competitive horse & Fed horses I hand show. The ones I just don't bother with I assign to the BM. Since my barns are arranged by breed, I also catch her mistakes as I hand-enter. Working out very well for me
I only joined a month ago and already have over $100,000 in profit using my BM, $347k total winnings. I'd say if you have geldings, the BM is pretty good at her job. Mares I find are not as good with the BM, maybe it's just me though.
I used to only use the BM haha. She made me money but not nearly as much as I make now. Doubling my fees was rare with my BM and I regularly make more than double what I paid