What are our options and alternatives when it comes to emergency alert devices?

Hi, my grandmother has a habit of taking sleeping pills at night to help her sleep. Once, she took four in a row because she couldn't fall asleep. The next day she was groggy and drowsy. She fell three times because of that. She also has diabetes issues and there have been times in the past where she has fallen/passed out due to extremely low blood sugar (from insulin shots). Anyway, we received a brochure about Life Alert and it seems like the perfect thing for her. However, I'd like to ask for your opinions and experiences with this product and if there are any other alternatives that we can consider? How much would it cost?