I have one and I LOVE it! It makes me feel so.much better.
My midwife uses them every time I go in for an appt, she first found the heartbeat with it at 10 weeks. I wanted to buy one, you can get one on eBay for like 80 bucks but after we had an ultrasound at 12 weeks, we found out the poor little guy doesn't like the Doppler noise, he covered his ears their the ultrasound. So my hubby said no because he doesn't want to torture his boy! Lol