This is day seven of not using shampoo and I'm really surprised how well it has gone. The first couple of days were pretty greasy, but after that not so much. No one who saw me would be able to tell I hadn't used shampoo for a week. It still feels a little bit oily, but only as much as if I had skipped one day of shampoo before.
Going no 'poo does take a little bit longer than just washing your hair with shampoo. There is no lather to spread it through your hair, so you have to really take the time to work in the baking soda. But other than that it has been no problem.
Oh yeah... and you have to rinse the vinegar out or you'll smell like a pickle factory. Duh. Can you tell I didn't read all the directions the first time? :)