Have bought some mb alphas and duke 650's.Both look like great traps.I really like the duke 650 pans and crisp firing system.So far not impressed with the alphas firing system as there is no click leveling the pan.Looks like I will have to carefully work with a file on them.

I can’t speak for the duke 550s, but I have mb 450s and duke 650s. I’ve caught coyote and fox in my 450s, and they hold up really well. All in all, they are awesome traps. However, I know I’ve missed some catches just due to the small jaw spread. We can’t use the 650s here on land, so I’ve only set them for beaver. The chain and swivels are definitely cheaper on the 650s, but they seem like decent traps. If your state allows you to use the 650 on land, I’d probably choose the largest trap you can legally use.