let me know if you find an ER9 around you and what you think of it. Been keeping an eye out myself but haven't run across one
Golf Galaxy in Pittsburgh had at least one. It works, at least to the point of rolling the ball dead straight every time. The face is very resistant to rotation. I found it interesting enough to consider but couldn't get over three things. First, for me, moving to a higher moi putter in the ER5, I reduced my tendency to hit lag putts way past the hole, but in doing so increased my chances of leaving very long putts short. It took some work but I finally think I have some feel for distance with the ER5 and I think that's about as far as I want to go with MOI; with the ER9 I found myself having to consciously put extra effort into anything over 10 feet or so, even indoors on the mat. Second, the sheer size of the ER9 and its squareness is off-putting to me. It's like the Borg ship on a stick. Third, it's kinda pricey. If it fit my eye and how I see breaks I'd probably dig for the extra couple of bills and learn to hit long putts with it. But for me, the ER5 is a better balance.