I won the midweek league average with an mmi3 4 years ago with an average of 75.
I currently use a less extreme version, but it's still a longer handle, shorter blade, 5 50s and 2 tons in the last 3 seasons midweek, and an avg of 38 at 144 sr is more than good enough for me to warrant it's usage.
People may ask why i use a normal bat on a Saturday, as my average isn't as good. But as I tend to be a lot less attacking, I do prefer to have a full size blade.
And although I open in both formats, it is to completely different jobs out in the middle,a nd different job require different tools.