Pros
You can use them to get into Japan and find a better school once you arrive and have your visa. Nothing else.
Cons
Starts with pointless training where you’re made to do awkward mock lessons with head teachers that are more concerned with smelling their own farts than dispensing useful advice. Next, you’ll either start working at a branch school where you’ll work 9 hour days with no breaks and be passive aggressively micro managed on every little thing. Or you’ll work at a franchise school and be left to the whims of whatever owner you get. Either way, you’ll definitely receive students you’re not qualified to teach, because this is a business and not an educational program. I ended up in a franchise and things were alright until the end when they decided to screw me over on a cleaning fee and utilities. When I tried to argue this, my boss went from friendly to ice cold and didn’t even thank me for my 18 months of work. 3 months later, I found out they’re giving me less than I should’ve gotten. There are good schools in Japan, this just isn’t one.