It's recommended before buying a AES PSU, regardless of what the bottom of your console says, that you actually open it up and take a look inside (as recommended in FirebrandX's guide).
Recently I had an issue where I bought a replacement PSU (5v/3A) for a "POW2" console, only to realise that my AES had some strange "NEO-POW2" PSU rated at 11V/700mA that isn't documented anywhere online (it does exist, I own the original PSU). The "PRO"-POW2 and "NEO"-POW2 are two entirely different supplies, so it turns out. Thankfully the seller realised his recommended PSU replacement guide on his site was incomplete and sent me a replacement 9V/2A PSU that works perfectly now.
I recently replaced all my original power bricks on Japanese consoles with aftermarket ones and couldn't be happier to get rid of the step down converter, which I only use for my Sega Saturn now.
I looked down on this for the longest time wanting to keep stuff as original as possible, but replacing external bricks with ones that work on local voltage is a must IMO -- They don't heat up and I believe are safer and more efficient to run.