I've had both just a mild hypo and more intense. For me it's a matter of watching really carefully and reacting to anything destabilizing really quickly. I've never sustained a happy hypo on it but I've never sustained a happy hypo ever so that's not indicative of much.

There is some program that therapists can get units for patients to use for the season and then return and I think it's free. I know nothing else but my therapist used it last year for a few people and told me about it. Googling might come up with something?