I just finished saying, the only reason I've even considered CFW is as a supplement to the existing setup I already have via the Gateway and emuNAND. On the emuNAND I already have it fully updated, able to run games with
cheats, and all my legit account stuff on there. Last I checked, if on the odd chance something broke irreversibly, and I had to use a different 3DS, even if I log in with my NNID I still will have lost what I legit purchased, and all my Ambassador stuff,
because Nintendo still ties those things to the system, which at that point would be tied to the (bricked) handheld that I can't recover from. And it's my understanding that it's not exactly possible to say, flash an emuNAND over the sysNAND at all, much less have it actually work afterward.
My goal was to at least have a way to then play the GBA and DSiWare that I already have, and don't have the heart to delete. After all, they
are mine. Either as Ambassador reward, or through the now defunct Club Nintendo program. And other members here made it sound like I could just have the respective exploit installers on my DStwo, and then I could simply just pop that in when I need to, install the respective 'sploit, and boot to the desired mode as need be.
that method was both simple enough and worked 100% of the time for me. I certainly wasn't trying to run a CFW all the time, unless there was one that could recognize the Gateway's red card and load stored ROMs on it. Again, since last I checked, a 3DS can only address a 32gig SD at max, while at least the Gateway card could have up to 128GB.
A part of me wished the 3DS part of the DStwo Plus would have worked, because I could have easily saw myself fill a 128GB microSD if I could have DS and 3DS games at the same time from the same card.