Wave Spacers vs Wave Revolvers

I run in both, but prefer the Revolver for fit and responsiveness on road runs. There is a bit of cushioning to the Revolver, which I didn't sense as much in the Spacer. Considering I train in NB900's and Revolver's exclusively I'd say the Revolver seems almost too cushioned relative to the 900's. The Spacer seems too unstable for my midfoot strike, yet I can see where certain gait types would enjoy it because there is adequate rear foot cushioning for heel strikers. All in all I prefer the wide toe box in the Revolver's and the 900's along with the low to the ground feel that both offer.

The Spacer is a wider shoe. The forefoot cushioning of it is a bit mushy. The revolver is a bit more responsive.

The Revolver has a strange fit. It's a little bit narrow right around the midfoot, but not in the heel or toe. My feet (average width) didn't feel too tight, but it felt like they were resting on the side-stiching (in the middle) as much as on the actual bottom of the shoe.

I'm a midfoot striker too. I wore the spacers for a few races and a few workouts and never wore them again. It just felt like they took too much energy out of my stride. The Revolvers, while more responsive, also felt more substantial and like enough shoe to train in as much as race in. I wore the revolvers for a few long races and ran very poorly. I never really liked how they felt on my feet. But I'll give them another shot.

One thing about Mizuno flats -- they run large. I had to buy a half size smaller than I normally wear.