I have a Sonoline as well. I got it in the mail a few days before our first appointment (which was at 9 weeks) and we were able to find the heartbeat after searching for a couple of minutes. I really like it, and I'm able to find the heartbeat every time, but a piece on the wand broke after about 3 or 4 uses. I believe I was wiping the excess gel off the wand, and the end of the wand just popped off (still attached by the wires). I am able to push it back down enough to still use it, but now it pops off all the time. So that's my only complaint. Otherwise, I love having it!