Fetal Doppler?

Almost 17 weeks pregnant and I've been back and forth about getting a Doppler. I feel like it would be a great way for my daughter, husband and I to bond with the baby. And I feel like my daughter would love it! Are they worth it? I've been reading some reviews and some say they don't work and not to waste your money but others say it works great! Would like to hear your opinions and experiences! Not looking to spend a fortune on one. The closet place I would be able to get one is at Walmart. Thanks ladies!