I took the plunge this morning, before I came to work. My Wii only had the boot channel stuff, no CIOScorp, no Starfall, no Preloader.
All installs mostly went according to guide. My Wii has an issue, it has always had it, must be an issue with the wireless router, where the first time you try and download something, it fails right away, then you try again, and it works. This happened twice during the installs, I just restarted whatever I had been doing, and it would download and work fine. Also, my first try with the IOS downgrader failed, but just like the guide advised, I tried again and it worked no probelm.
My TvC backup, patched to USA and brickbreaker, works fine. Shows up in the disc channel, and runs from it.
HBC is also running fine.
Thanks for this it is very cool. I can test stuff later, and give more details, once I get home from work.