I *love* my Mizunos. But, they are not for trail running. I love them because they are flexy and loose in the toe box (mesh?) and don't annoy my bunion. But, I like and need the support in the heel. They are perfect for me. I wear them at the gym for boot camp and for any outdoor/indoor running I do.
My trail runners are acutally Merrell light hikers. I've thought about getting trail runners, but they work.