I bought one after it was recommended to me by some friends who had recently given birth. I ended up having an emergency c-section a little over a week ago and I started wearing the band when I left the hospital 3 days post-surgery. I love it. I totally feel supported and I find that I can move around easier when I'm wearing it. I had an allergic reaction to medical adhesives used during my surgery that has left a rash on my tummy, so it gets a little uncomfortable after wearing it most of the day so I take it off.
I would recommend it and think it would help even with a vaginal delivery.