I bought a used Navajo Chief a while back and it's a great little shooter. It's only 40# @ 28, and although I never shot it through a chrony, I can't tell much if any difference between the speed of the 40# Chief, and the 51# Chek-Mate I was shooting. I guess what I'm trying to say is I didn't have to change my aiming process. Using the same arrows by the way.
I also emailed Roy with some questions and he was quick to reply, even though I never bought the bow from him. That means a lot to me. I've emailed lots of bowyers in the past, as a potential buyer, only to never have my emails returned.
Roy seems top notch to me.
hnh