I got these shoes mainly because a buddy of mine had some and my Musha 4's were coming to the end of their life.
The Musha 5 wasn't avaiable, I was hoping it was going to be really something, it wasn't, the Musha 4 is better.
Back to the Ronin. Really like the shoe. It has a "slipper" feel to it rather than the "dancing pump" of the Musha 4. I prefer the Musha, but I'm happy in the Ronin.
The construction gives you a lot of room in the toebox but the feel is that its a narrow platform. I've logged a lot of hours in them now. Done a few half and 30K runs in them.
Satisfied. If you want an 8mm shoe for training or casual racing then this is a really nice option.
If you want an outright racer get the Ekiden, if Mizuno is your brand of choice.