Hi,
First of all, the global situation : I play ACNL with the Welcome Amiibo update. I use Soundhax for hacking and I've done it since january now and didn't seem to have any problem (I've always followed all the steps and never done the dangerous things mentioned in the Save Editor site help...
Cruisn on the Wii is one of my personal examples of that, it's considered one of the worst games of all time, I loved it and completed it several times.