S.M.
I also got the BOB Revolution and I LOVE it! It is smooth,and easy to push. It has a really good brake, and the front wheel can rotate or lock for straight paths. The best is it colapses smaller than my Chicco stroller, and is lighter! my son is 5 mo and I have had him in it since he was 3 months (he is a big boy). I got the orange one so it can easily be seen on streets by cars.
It was worth every penny. In fact he is sleeping in it right now since our walk.
We got our BOB on sale for $350, again: worth every penny.
Good Luck!