Anyone use a medical alert system around here that works?

My aunt lives in Delray Beach and she recently had a scary moment while walking outside. She felt faint and had to sit down on the sidewalk until a neighbor helped her. We talked about getting her one of those emergency alert buttons but I’ve been reading that coverage can be hit or miss depending on the area. Bay Alarm Medical Alert seems popular but does it actually work well in Delray Beach? She’s off Atlantic Ave and her place doesn’t get the best reception. Would love to hear from someone nearby who’s used it.