This is an excellent breast feeding aid! The pillow is quite firm, more like a thick foam ledge, that keeps baby at the right level when nursing. When it is strapped on, you can literally stand up and walk (holding the baby in place of course) and if won't slip down.
I prefer the fleece deluxe covers to the cotton ones and replacement covers run $16 - 19 on Amazon so this is a great deal for the pillow and cover.
Don't even think of a Boppy for breastfeeding, they are worthless for that - especially if you are somewhat fluffy or had a c-section as they push uncomfortably on your abdomen.
I will admit that after I had the whole breastfeeding situation down and kiddo latched easily, I didn't need an aid as often, but this was invaluable the first 2-3 months.