MobileMilitia has a full review on these new devices and they speak very highly of them.
I hope that these items sell well for multiple reasons, but I would love to see them continue to make similar products for other older systems.
Them expressed interest in making wireless controllers for both the Sega Saturn and the Dreamcast. I would be in heaven and would instantly play those systems more if I had such a setup. Keep in mind Messiah’s wireless controllers use the same technology that Nintendo’s Gamecube Wavebird controllers use, so they work much more reliably that wireless controllers from previous generations.