I love them, and am surprised to hear they aren't cold hardy. I thought I had read in several places that they are hardy to zone 5.
Mine is in a pot, I bought a small Basjoo but it turned out to be a Musella. It was in quite a bit of shade last summer and only morning sun this summer. The leaves are big and very blue.
I don't know how to post photos here, I guess you need an online photo source?? So, I put a photo of mine in my gallery.
Banana Gallery - Musella_7-30-09
I think they're probably best when they are single plants and don't have a ton of pups. Mine has never flowered for me, either.