hi
I used it before. can see the difference from my 2 children. i started to use it at my 2nd one ,she is very alert since she came out, when breastfeeding her at the first time ,i talk to someone , she turned her head and looked at my face but this never happen to my 1st one..till now she always turn her head to behind to see what i'm talking while sitting in the pram when we go out. can't give a lot comment on this product. for me not only this, the more important is always communicate with your baby surely give you a surprise and the relationship with him/her is very closed.