Here is quick chronicle of my experience with HH here in the Comox Valley. we are roughly USDA zone 6b, so keep that in mind.
Helen's Hybrid Update
The potential advantage to HH as I see it, as a supposedly edible banana, is that it does grow quickly here, getting reasonably large in one season, even though our nights are generally pretty cool. I also happen to think it's a particularly beautiful plant. I haven't quite figured out the perfect combo for over wintering and then getting a good Spring start, but I am getting there. Someone with more experience/expertise over wintering tender bananas shouldn't have any particular problems with it.