I am currently 4 months pregnant, and have been using this for a few weeks. I first started looking into something like this when a friend showed me another product (listed on here, don't remember the name, starts with an R and is $130). I loved the idea and love music but that was a bit much for our first time parents budget.
I can't feel if the baby responds to it at all yet...or know if it ever will, but I like the idea of it! It is really comfortable, the fabric is nice and plush, although I have to make it a tad tighter than the smallest setting still (which is not a big deal since it is velcro. I've worn it both over a shirt and next to my skin, and it doesn't rub or chafe or do anything uncomfortable.
The first time I used it, I was listening with headphones also, and told my husband that I liked it, but would just have to trust that it was working, because how else would I know? I'm not in my belly after all! Well, the next time I used it without...