I have used a hypo band & it didn't work for me. They don't detect hypos or blood sugar, they detect cold sweats. So if you reliably get a cold sweat as your hypo symptom they might be really good for you, if not it will just be an annoying jangly thing on your wrist.
Is there a reason you are looking at hypo alerts? Are you struggling with awareness or hypo at night?
I got a CGM which is accurate and does reliably alarm when I'm dropping. But this is an invasive continuous glucose monitoring system which costs a lot more than a hypo band.