Purchased the device last year, to track and document frequent arrythmias. I stopped using it as I noticed (as did my EP when I showed him printed results) that there was a lot of interference that showed up on EKG results, and these were often interpreted as abnormalities on those reports. This despite my practicing and ensuring that I had good connections, was still and skin was cleaned to remove oils, etc. I put the thing in a drawer and forgot about it. I Was contacted via email some time later for evaluation of device, I informed them of the interference issues, and told them I couldn't use the device that way. After being informed that they had had no other such complaints, they gave me some troubleshooting suggestions. When I informed them I had received a pacemaker, they blamed that on the interference I had seen. This even though I had used the SonoEkG before I got the pacemaker (as I pointed out several times). They insisted that the problems I saw were due to the pacemaker, and in fact informed me that the use of this device is NOT recommended for people with pacemakers or other ICDs. While I can't recommend the device, (or the technical expertise of their "Happiness Engineer" for that matter), their customer service was very good. When I first spoke (via email) to their customer service rep, she offered to send me a replacement device free of charge. I turned that down as I saw no reason to replace a device with what I saw as intrinsic flaws, and then she offered to return my payment for the device, which was done. She told me I could keep the device or toss it, (I tossed it). I do think that the company should put a disclaimer on their website (and anywhere else they're advertised about the company's recommendations that their product not be used by people with pacemakers.