Just some extra notes to add to this thread. XFlax, I downloaded the d2x Custom IOS Installer from both wiiguide and oscwii.org and both did a size comparison on the file and tested both in a Wii and I got the same results as Hitotari.
I only care for 2 reasons, because obviously ModMii gives me another path to accomplish most things. My two reasons for caring are: 1) Just the ease when doing testing of being able to try different combinations without having to return to my computer. 2) I have been doing some tests, specifically with music games and I think I have a couple of places where you can only get multiple mics to work with beta-53, which last time I looked in ModMii there was not any beta-53.
I am one of those jokers with multiple Wiis, so I will do my tests on one of the other ones that already have what I need and when I am finished and have good concrete testing whether it is really necessary or not, I will upload for anyone who cares.
Thanks for keeping my hobby alive.