Adam Hartzell
Yup, I'm a lefty.
I think when it comes down to some segments of golfers MOI means much more than it will to those that practice their putting stroke and have a solid putting stroke. Missing the center of the face of a putter is actually fairly common. One of the companies did a study that showed the average golfer missed the center of the face by more than half an inch something like 47% of the time. I know I have the study somewhere and will try and find it.
I'm with JB here. Whenever my putting gets out of wack, I switch to the highest MOI putter I can get my hands on. Once things smooth out, its back to the blade for me.