Here I will walk you through my dress forms and talk about the pros and cons of each one. All of them are in use, but for different purposes and preferences. Adjustable mannequins do have a purpose and are not a waste of your money, even though they are not the higher quality ones. Maybe not for modeling clothes, but they are really helpful for fitting a garment!
Recommended dress forms:
https://amzn.to/2ZwYgUe
My Dress shop:
thetailoretteshop.etsy.com
Music credits:
hooksounds.com
bensounds.com