Autos will show their sex in 10-14 days from germination. So you dont have to wait that long. Some strains do take an extra week to show.

Advantages? Not many if you ask me. You sacrifice yield/clones for a somewhat faster harvest (compared to seed to bud in reg). Also you can grow them easily on your balcony or amongst other plants since they are small.

Serves a purpose to some people I suppose.