As you seem to be on the fence about installing them, let me suggest you do not, and save your money.
I installed the Rosen visors in my old J and was not happy with them. They are well made, but I think the Mooney cabin and windshield shape are just not improved with them. Despite being much larger, they did not do much to block additional sun. I think it was due to how far back you are from the windshield edge. In addition, the attachment to the pivot would always get loose, so I had to keep a screwdriver handy to tighten it everytime I swung it to the side window. That was my greatest annoyance, as it meant I could not ignore them. It would be great if Rosen had a better attachment that did not torque the mountaing screw everytime you swung the visor to the side, but they would still add little sun blockage, in my opinion.
YMMV, and others may have better experience. It seems from reading MS, the LASAR visors, long discontinued, got better reviews. And some homemade lenses that used the original mounting have done very well.
-dan