I use the Aeotec Siren 6, not problematic at all. Jumping quickly between various sounds can cause it to have a brain hemorrhage - so don't do that. It's been great for us - I've tried other sirens that I have not liked: one worked fine but wouldn't turn off in a reasonable amount of time, the other (Everspring) seemed good at first but would not always sound a siren when asked to, kinda something you want to work reliably so out it went. So far, the Aeotec has sounded every time without fail.