I've used it multiple times, including to edit things like attributes and friendship levels. I used it in year 3 on a throwaway account to test it first, and that account is now in year 7 and not banned yet, so I'd say it's safe.
Still, you'd best look up how to use it safely first. Most values are encrypted, meaning you can't just edit 1 value: you have to find the "XOR key" first. I posted
a guide a while ago with more info.
Also, I'd recommend not using massive values (some guides will just tell you to use numbers like 99999999). You can use
this guide here to see numbers for friendship levels, attributes, magizoology etc... So for example I use 200000 for attributes, as this takes you to arround 80, which is more than enough for now. Any higher would be suspicious.