Quality is pretty okay and you get get lots of things on sale or if you have a gap/oldnavy/bananarepublic card you get some money back on what you spend. The shipping time took about a week to get to me..... but maybe longer to get to Japan.
I wore old navy alot through the years losing weight and also before when I was plus size because there wasn't a surfeit of places to shop from, as everyone here well knows.
I, unlike Lilion, find that their clothes can run a little big.

I was a 2-3X at my highest and a size 24-26W.