Sometimes you get stylists who ignore your preferences. For example, I had on the preferences that I don't wear sleeveless clothes. I was sent an entire box of sleeveless options, so there was no way I'd be keeping any of it.
If you get a good stylist, you may be in luck! They can look at your Pinterest board and preferences to choose great clothes for your needs. If it doesn't fit right, you can exchange it for a different size if it's available.
It's a convenient way to add to your closet without the stress of shopping. Just hope you have a good stylist or it's a waste of time.