I bought a Nintendo DS in Florida about a month back, and bought a US -> UK adapter but i needed a step down converter.
This one worked great.
There's no chance of going anywhere near 45W, i think the DS does around 1W if that lol.
So if you went abroad and bought a PSP, DS, Camera's etc. so anything electrical that needs charging this is a good choice for you.
It's really cheap as well, so there's nothing to complain about.
The only thing that might be an issue is that it can get quite warm, so don't be stupid and leave it my flammable stuff, say like your bed.