i have had MobileHelp for nearly two years. I investigated the others out there that are similar, but the fact that Mobile Help comes with a small portable unit that I can easily take with me and it has a GPS inside it convinced me that this was the best product out there. I take that portable unit wherever I go and know that I am protected. I just put it in my pocket or purse and off I go. Fortunately, I haven't needed to call upon the other services MobileHelp offers. I wear the button/pendant most of the time. It is lightweight and doesn't bother me. If I choose to, I can wear the wristband, instead. I alternate between the two. Both give me a sense of security for which I am grateful. If there is a power loss, the batteries in both last for 24 hours. The portable unit can be charged elsewhere, too. I am delighted with MobileHelp and recommend it to anyone with a disability.