Hiya,
I wasn't going to get one... but I couldn't resist in the end, as quite a few girls on here had bought the Anglesounds, and found it brilliant. I have one now, but I've yet to find the heartbeat. I only allowed myself one when I could feel Bubs move, so that I wouldn't worry of I couldn't find the heartbeat..... There are a few people on here do hear their babies early on though.....
As for the safety issue.... The Angelsound is really good, in the fact tht it works the same as a stethoscope... so there are no waves being sent into the baby....
When I mentioned to my midwife that you could buy the only she was using, on ebay, she got quite cross!! She said that they are still completing studies into whether too many scans can damage your baby... and that the doppler that uses the waves to listen in, are actually way stronger than the scan gun... so you could end up using it everyday, with the possibility of causing harm....
Hope this helps
