Pulled the trigger and picked this up.



This thing works pretty damn well, and it can use the HD Retrovision Sega Genesis cables, so the picture and sound are amazing. Ultimately I went with this over the US Turbo Duo, and I'm pretty happy with my choice.
This thing IS a little snug on a TG-16, and it's clearly meant for a PCE. However, if you unscrew the 2 screws slightly it becomes a more reasonable grip.
Also, the TG-16/PCE mini has been announced. So that's something...