I am about this close *holds thumb and index finger a ridiculously small width apart* to buying a doppler from ebay. I have one pro and one con.

Pro, I'll be able to hear bubbies heart beat whenever I want, easing all my insecurities that it's died without me knowing

Con, I don't know how hard they are to use and if I can't find bubbies heart beat I'll be a flying mess to the nearest Dr's surgery.

Thoughts? Has anyone used one of these before and thought it to be more trouble than it's worth? Or found them to be brilliant?

TIA